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| | Meiosis Tutorial |
 | | This exercise is designed to help you understand the events that occur in process of meiosis, which takes place to produce our gametes. |
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http://www.biology.arizona.edu/cell_bio/tutorials/meiosis/main.html
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| | meiosis - definition of meiosis in Encyclopedia |
| | This arrangement is rotated by 90 degrees when compared to meiosis I. In Metaphase II the centromeres behave as two entities, organising fibres on each side to both poles aligning on the equator. | | | Single-stage meiosis has been suggested but not convincingly demonstrated. | | | Prophase I (the prophase of meiosis I) is the longest phase. |
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http://encyclopedia.laborlawtalk.com/meiosis
(838 words)
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| | Meiosis |
| | Chromosome behavior in meiosis II is like that of mitosis. | | | Link to discussion of the mechanism of cohesin breakdown. | | | Meiosis is a process of cell division in eukaryotes characterized by: |
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http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Meiosis.html
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| | meiosis |
| | Meiosis does not work as a figure unless one senses the degree of difference between the label and the thing it labels. | | | However, this term more often names understatement done by denying something contrary to what one means. | | | Meiosis, as a kind of understatement, names one of the two principle means of communicating through irony (the other being overstatement — see hyperbole, below). |
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http://humanities.byu.edu/rhetoric/Figures/M/meiosis.htm
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| | Meiosis |
| | In meiotic division I, by contrast, the kinetochores on both sister chromatids behave as a single functional unit, as their attached kinetochore microtubules all point in the same direction so that the sister chromatids stay together when the duplicated homologs separate (see Figure 20-11). | | | We shall focus our discussion of gametogenesis mainly on mammals. | | | Although the molecular basis of the interference is unknown, the synaptonemal complex is thought to mediate the process. |
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http://www.ncbi.nlm.nih.gov/books/bv.fcgi?db=Books&rid=mboc4.section.3686
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| | Cell Division: Meiosis |
| | The human life cycle follows the basic pattern found in all sexually reproducing organisms; meiosis and fertilization result in alternation between the haploid and diploid condition. | | | Fertilization: union of two gametes to form a zygote (restores diploid condition) | | | ---------------------------------------------------------------------------------------- COMPARISON OF MEIOSIS I AND MITOSIS ---------------------------------------------------------------------------------------- Meiosis I Mitosis Prophase Synapsis occurs to form tetrads. |
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http://webpages.marshall.edu/~adkinsda/b120ch12.htm
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| | What's meiosis? |
| | Understanding the process of meiosis is therefore fundamental to understanding human health and development. | | | Any defects in the careful choreography of meiosis can therefore have profound effects on the health of the gametes and the resulting zygotes. | | | In humans, it is estimated that at least 10% of conceptions have defects that probably occurred during meiosis of either paternal or maternal gametes. |
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http://www-rcf.usc.edu/~forsburg/meiosis.html
(588 words)
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| | Meiosis |
| | In that familiar animal, the human being, the sexual cycle can be considered simply in terms of meiosis, mitosis, and a clever mechanism by which outcrossing is achieved. | | | Meiosis is the process by which variable haploid cells are produced. | | | Once these statements start making sense you may consider yourself to be on the verge of having an understanding of meiosis and some of its consequences. |
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http://www.mansfield.ohio-state.edu/~sabedon/biol1115.htm
(2930 words)
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| | meiosis. The New Dictionary of Cultural Literacy, Third Edition. 2002 |
| | Meiosis is a key process in sexual reproduction. | | | The sex cells combine in fertilization to produce a new individual with the full number of genes—half from each parent. | | | In the ovaries and testes, meiosis produces a great variety of sex cells (sperm and ova), because the genes of the parent cell can be split in many different ways. |
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http://www.bartleby.com/59/21/meiosis.html
(200 words)
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| | Meiosis |
| | Meiosis is divided into stages, much like mitosis. | | | Unlike mitosis, however, meiosis is a two-step process, consisting of two sequential cell divisions. | | | Therefore, one basic difference between meiosis and mitosis is that at the end of meiosis, there are haploid four progeny cells, whereas at the end of mitosis, there are two diploid progeny cells. |
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http://www.emunix.emich.edu/~rwinning/genetics/meiosis2.htm
(465 words)
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| | GENETICS |
| | Mendel's first law (hereditable factors occur in pairs that can be separated in the process of sexual reproduction) is really a natural consequence of meiosis. | | | This may have little effect on the growth of the progeny but there may be further problems during meiosis in the next generation. | | | When meiosis occurs in a heterozygous organism each of the gametes has an equal chance of getting one or other allele. |
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http://www.hcs.ohio-state.edu/hcs300/genetic.htm
(1428 words)
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| | Modeling Meiosis |
| | Meiosis takes place in all organisms that reproduce sexually. | | | Meiosis I is radically different from mitosis, however, and the differences immediately become apparent. | | | Build the premeiotic interphase nucleus much as you did the mitotic interphase nucleus. |
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http://www.wooster.edu/biology/wmorgan/bio306/Modeling_Meiosis.html
(1242 words)
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| | Meiosis |
| | Below is a response to a person asking about a teacher that was teaching meiosis using the stages as 'double diploid' etc. | | | During the prophase of meiosis I (classically divided into stages: Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis), homologous chromosomes pair to form bivalents, thus allowing crossing-over, the physical exchange of chromatid segments. | | | Each division can be divided into 4 phases similar to those of mitosis (pro-, meta-, ana- and telophase). |
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http://ccgb.umn.edu/~mwd/cell_www/chapter3/meiosis.html
(359 words)
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| | Dr Chromo's school: meiosis |
| | Maybe you could think of all the different processes that led to variation in the meiosis... | | | Each has a set of chromosomes, and will meet another set of chromosomes in another cell in order to constitute a fertilised egg which will give a fully working new individual (plant or animal). | | | During meiosis, DNA replication (which makes the cell have twice its usual amount of DNA) is followed by two cell divisions. |
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http://www.rothamsted.bbsrc.ac.uk/notebook/courses/guide/meiosis.htm
(698 words)
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| | Meiosis Tutorial |
| | A tutorial on the relationship between chromosome movements in meiosis and the segregation of alleles in meiosis | | | Acknowledgments - This project was funded by a grant from the Instructional Improvement Program, Academic Programs, University of California, Santa Barbara. | | | To view the presentation, you must install Macromedia's Shockwave and set your display to at least 800 x 600 pixels |
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http://tutor.lscf.ucsb.edu/mcdb/tutorial/meiosis
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| | Meiosis - Wikipedia, the free encyclopedia |
| | Prophase I is the longest phase in meiosis. | | | The process of meiosis in males is called spermatogenesis. | | | Meiosis uses many biochemical processes that are similar to those used in mitosis in order to distribute chromosomes among the resulting cells; however the outcome is very different. |
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http://en.wikipedia.org/wiki/Meiosis
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| | Mitosis World |
| | Meiosis and Mitosis Review Questions-test yourself with this quiz | | | Mitosis Word Search-a fun way to pass your time and learn | | | Darryl and Rick's Mitosis and Meiosis Home Page |
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http://www.bio.unc.edu/faculty/salmon/lab/mitosis/mitosislinks.html
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| | LabBench |
| | Meiosis follows phases similar to those in mitosis, but the outcome of the process is very different. | | | Instead, we focus next on one particular aspect of meiosis, crossing over. | | | Meiosis reduces the chromosome number of the parent cell so that four daughter cells are produced, each with one-half the chromosome number of the parent cell. |
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http://www.phschool.com/science/biology_place/labbench/lab3/concepts2.html
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| | Biological Basis of Heredity: Cell Reproduction |
| | Meiosis is a somewhat similar but more complex process than mitosis. | | | The complete meiosis process in human males takes about 74 hours. | | | That happens only at conception as a result of chemical changes that occur when the main part of a sperm cell enters the ovum. |
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http://anthro.palomar.edu/biobasis/bio_2.htm
(1991 words)
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| | CELL DIVISION: Meiosis... |
| | phase is "diploid", and is that part of the life cycle in which meiosis occurs. | | | Meiosis may be considered a reduction phase followed by a slightly altered mitosis. | | | Meiosis occurs in a relative few cells of a multicellular organism, while mitosis is more common |
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http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookmeiosis.html
(1469 words)
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| | Meiosis |
| | Many of the mechanics of the processes of mitosis and meiosis are similar, but the outcomes are very different. | | | During the two divisions of Meiosis, the homologs separate. | | | Either Homolog can wind up in any one gamete, the orientation is random, This means that there is a 50-50 chance for the daughter cells (gametes) to get either of the parent's homologs for each type of chromosome. |
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http://bioweb.wku.edu/courses/BIOL115/Wyatt/Genetics/Meiosis.asp
(398 words)
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| | Chapter 10 |
| | Meiosis occurs in the sex organs of organisms. | | | Meiosis occurs in two phases: Meiosis I and Meiosis II. | | | If the chromatids do no separate properly during meiosis, then there is an odd number of chromosomes (too many or too few). |
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http://www.biojag.com/biojagfolder/ChapterNotes/chapt10Meiosis.htm
(524 words)
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| | Biology4Kids.com: Cell Function: Meiosis |
| | MEIOSIS I: This is basically like the PMATI of a regular mitosis. | | | Meiosis happens when it's time to reproduce the organism. | | | Meiosis is different because there is something called crossing-over that happens with the DNA. |
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http://www.biology4kids.com/files/cell2_meiosis.html
(519 words)
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| | 100 Concepts of Biology |
| | Gametes are generated in a process called meiosis. | | | During the first meiotic division (Meiosis I) the each pair of maternal and paternal chromosomes segregate from each other. | | | The haploid cells that result will later develop into mature gametes. |
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http://mywebpages.comcast.net/biologycentury/pages/meiosis.html
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| | Meiosis (figure of speech) - Wikipedia, the free encyclopedia |
| | Meiosis is a figure of speech that intentionally understates something or implies that it is less in significance or size than it really is. It is a form of litotes, but litotes often uses understatement to amplify the importance of something, while meiosis aims to make its subject appear smaller. | | | Meiosis is also a method of cell division. | | | For example, a lawyer defending a schoolboy who has set fire to his school might call the act of arson a "prank." |
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http://en.wikipedia.org/wiki/Meiosis_(figure_of_speech)
(209 words)
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| | Human Chromosomal Abnormalities: Glossary of Terms |
| | It takes place mostly in the ovaries of humans and other animals. | | | a female sex cell or gamete that has completed all of the phases of the meiosis process. | | | It takes place in the testes of humans and other animals. |
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http://anthro.palomar.edu/abnormal/glossary.htm
(3705 words)
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| | Meiosis |
| | The process of meiosis has many similarities to the process of mitosis--chromosomes replicate before the process begins and shorten and thicken to look like the chromosomes at the beginning of mitosis. | | | As a human develops from a zygote to a sexually mature adult, the new combination of genes in the zygote are passed on with precision to all somatic cells of the body by the process of | | | It is estimated that during meiosis in humans, there is an average of two to three crossovers for each pair of homologous chromosomes. |
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http://www.contexo.info/DNA_Basics/Meiosis.htm
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| | Genetics@TTU |
| | The widespread use of sexual reproduction by most organisms must indicate that the ability to generate genetic diversity through meiosis is extremely valuable. | | | Meiosis, on the other had, produces cells that have various combinations of chromosomes, as each member of each chromosome pair separate and are randomly segregated to the gametes. | | | The correlation of the distribution of chromosomes pairs during meiosis I and the random segregation of pairs of alleles described by Mendel should be obvious to you. |
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http://genetics.biol.ttu.edu/genetics/Lecture/red07.html
(1152 words)
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| | meiosis |
| | Thus the spores are haploid and in lower plants such as mosses they develop into a haploid plant called a gametophyte which produces the gametes (see alternation of generations). | | | The variation produced is inherited, which means that evolution can take place as a result of the natural selection of certain variants to suit a changing environment. | | | The way that meiosis gives rise to variation is by recombining genes from chromosomes in new ways. |
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http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0015134.html
(463 words)
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| | Meiosis |
| | There is no crossing-over in mitotic prophase; there is crossing-over in prophase I of meiosis | | | Meiosis occurs at different points during life cycle of various organisms | | | Mitosis occurs more often because it allows growth and repair of body tissues in multicellular organisms; meiosis only occurs at certain times in the life cycle of sexually reproducing organisms |
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http://arnica.csustan.edu/biol1010/meiosis/meiosis.htm
(910 words)
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| | Meiosis |
| | Without sexual reproduction, offspring are genetically identical to the parents and to each other: Such a group of individuals is called a clone. | | | Yet, unlike in mitosis, in meiosis homologous chromosomes pair up on the spindle, laying so close to each other that they often become intertwined. | | | Meiosis is the process of cell division by which gametes with half the number of chromosomes are created so when sperm and egg unite in sexual reproduction the diploid number of chromosomes is reconstituted. |
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http://www.scientia.org/cadonline/Biology/genetics/meiosis.ASP
(833 words)
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| | Why Meiosis is my Favorite Biological Problem |
| | Introduction to The Problem of Meiotic Chromosome Pairing Background: the biology of meiosis The commingling of genetic information from two sources is a universal process in biology. | | | It must be used at some point in meiosis, as intragenic recombination shows a precise recognition of homology. | | | Obviously, some regulated process is also required to accomplish correct discrimination of homologs. |
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http://www.ocf.berkeley.edu/~pcarlton/meiosis.html
(992 words)
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| | meiosis |
| | Meiosis occurs only in the process of gametogenesis, i.e., when the gametes, or sex cells ( | | | mitosis: Meiosis and Amitosis - Meiosis and Amitosis Mitotic division is the method of nuclear division of the somatic (body)... | | | Additional search results provided by HighBeam Research, LLC. |
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http://www.infoplease.com/ce6/sci/A0832543.html
(380 words)
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| | Meiosis: Introduction |
| | Animations show the process of meiosis in a dynamic way. | | | You will find information about the process of meiosis, and the relevance of meiosis to genetics. | | | This BioCoach activity will help you review meiosis, the two successive divisions of a diploid cell of a sexually reproducing organism that result in four haploid progeny cells, each with half the genetic material of the original cell. |
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http://www.phschool.com/science/biology_place/biocoach/meiosis/intro.html
(158 words)
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| | Cell Division: Meiosis & Mitosis |
| | E-Lab in Biology: Mitosis and Meiosis - Use elements of this e-lab to become familiar with the various stages in mitosis and meiosis and to understand the changes in chromosome number that occur during each of these forms of cell division. | | | Students will demonstrate each phase of mitosis and the main characteristics of each. | | | A lesson to teach Meiosis and Mitosis - A lab using an onion to have students observe different phases of mitosis. |
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http://www.kn.pacbell.com/wired/fil/pages/listmeiosisst.html
(506 words)
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| | Meiosis Introduction |
| | The hypothetical organism is 2N = 4 and thus has two pairs of homologous chromosomes - remember one chromosome of each pair was donated by the gametes that formed this individual. | | | The purpose of this presentation is to help you understand the movements of chromosomes in meiosis and how Mendelian genes segregate in meiosis. | | | Note that one of the gametes that formed this organism must have had the genotype AB (blue parent) and the other gamete must have been ab (red parent). |
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http://tutor.lscf.ucsb.edu/mcdb/tutorial/meiosis/meiosis.htm
(293 words)
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| | NOVA Online 18 Ways to Make a Baby How Cells Divide: Mitosis vs. Meiosis |
| | Meiosis, as described above, is the process by which certain sex cells are created. | | | Find out through this feature, which provides a step-by-step, side-by-side comparison of meiosis and mitosis. | | | Others cells in your body contain 46 chromosomes: 23 from your father and 23 from your mother. |
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http://www.pbs.org/wgbh/nova/baby/divide.html
(278 words)
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| | SUE - MEIOSIS |
| | Meiosis explains how in sexual reproduction, traits that are on two different chromosomes in parents can come to be recombined in an offspring. | | | This stage shows the difference between meiosis and mitosis. | | | This is when the maternal and paternal chromosomes are in close proximity to each other. |
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http://www.stanford.edu/group/Urchin/meiosis.htm
(444 words)
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| | Cell Division Tutorials |
| | State Mendel's principles of segregation and independent assortment and explain their physical basis in meiosis. | | | Describe important similarities and differences between mitosis and meiosis. | | | Name, identify, and describe the important events of meiosis. |
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http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/cell_division.html
(84 words)
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| | meiosis - definition of meiosis in the Medical dictionary - by the Free Online Medical Dictionary, Thesaurus and ... |
| | This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. | | | meiosis - definition of meiosis in the Medical dictionary - by the Free Online Medical Dictionary, Thesaurus and Encyclopedia. | | | The special process of cell division in sexually reproducing organisms that results in the formation of gametes, consisting of two nuclear divisions in rapid succession that in turn result in the formation of four gametocytes, each containing half the number of chromosomes that is found in somatic cells. |
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http://medical-dictionary.thefreedictionary.com/meiosis
(119 words)
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| | Synaptonemal Complexes |
| | Microscopic observations reveal an elaborate structure developing during pairing of homologous chromosomes in meiosis. | | | Prophase of meiosis I occurs in morphologically distinguishable stages (above). | | | Axial elements approach one another, becoming lateral elements. |
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http://opbs.okstate.edu/~melcher/MG/MGW3/MG3521.html
(491 words)
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| | Lillium Meiosis |
| | Gametes fuse to produce the diploid generation, which grows into the adults. | | | During meiosis I, the chromosome pairs are divided between the two cells produced. | | | During meiosis II, the two sister chromatids are segregated into each daughter cell. |
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http://www.dmacc.cc.ia.us/instructors/lillium.htm
(279 words)
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| | mcnallymovies |
| | As shown in the diagram above, meiotic maturation initiates with germinal vesicle breakdown in the most proximal oocyte in the gonad. | | | The meiosis II spindle (which has 12 rather than 6 sister chromatid pairs, evident as dark holes) rotates from an orientation perpendicular to the plane of focus. | | | Only the early stages of meiosis are shown in this sequence. |
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http://www.mcb.ucdavis.edu/faculty-labs/mcnally/mcnallymovies.htm
(873 words)
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| | BiologyDaily.com -- Meiosis Tutorial |
| | Meiosis is an important biological concept that all students should know and understand. | | | This tutorial was made to help simplify a somewhat confusing, but important process. | | | Below is the AP Biology Laboratory Manual's Introduction to meiosis |
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http://biosphere.biologydaily.com/help/node/5368
(117 words)
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| | [No title] |
| | In flowering plants, meiosis occurs within anthers to produce microspores (which develop into pollen) and within ovules to produce megaspores (which develop into the embryo sac). | | | Although some intermediate stages are missing, observe the stages in the development of pollen and embryo sacs and try to identify the stage of meiosis pictured. | | | Observe the following images which illustrate various stages of meiosis using beads as models. |
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http://www.und.nodak.edu/dept/jcarmich/102lab/Meiosis10/meitest.html
(216 words)
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| | Lab Manual Exercise #2A Meiosis |
| | Assuming that the lizards are diploid and their unfertilized eggs develop by mitotic oögenesis (without the reduction division of normal meiosis), then their offspring would be clones of each other. | | | This number is greater than all the atoms in our solar system. | | | During this meiotic process her 16 pairs of homologous chromosomes become altered by crossing over and reshuffled through random assortment, resulting in haploid eggs that are not chromosomally identical. |
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http://waynesword.palomar.edu/lmexer2a.htm
(3184 words)
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| | meiosis |
| | Interphase in meiosis is identical to interphase in mitosis and there is no way, by simply observing the cell, to determine what type of division the cell will undergo when it does divide. | | | Here is where the critical difference occurs between Metaphase I in meiosis and metaphase in mitosis. | | | Although meiosis appears much more complicated than mitosis, it is really just two divisions in sequence, each one of which has strong similarities to mitosis. |
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http://taggart.glg.msu.edu/bs110/meiosis.htm
(577 words)
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| | Meiosis |
| | Meiosis involves a reduction in the amount of genetic material. | | | Four stages can be described for each nuclear division. | | | Meiosis differs from mitosis primarily because there are two cell divisions in meiosis, resulting in cells with a haploid number of chromosomes. |
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http://www.accessexcellence.org/AB/GG/meiosis.html
(202 words)
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