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| | BIL 105 - Lecture 20 |
 | | "+" and "-" hyphae fuse, and the haploid nuclei mingle. | | | these two structures fuse, and the haploid nuclei of the antheridium enter the ascogonium. | | | Inside the asci, karyogamy occurs, with + and - nuclei fusing into diploid nuclei. |
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http://fig.cox.miami.edu/Faculty/Dana/105F00_20.html
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| | Cell, Socks, and Sex |
| | This will strengthen vocabulary concepts like homologus pairs, diploid, haploid, tetrad and many others. | | | Often, throughout the genetics lessons, when I receive questions, I just pull socks out of the box and have the students think it through to answer their own question. | | | This lesson will also clear up concepts like sexual determination, trisomy and even twining. |
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http://www.accessexcellence.org/AE/AEC/AEF/1994/russell_socks.html
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| | [No title] |
| | In this experiment you will use a set of haploid strains to produce the diploid strains that would be produced in the second generation of the traditional experiment. | | | Using sterile toothpicks transfer and mix the haploid strains in all possible combinations at the intersections of the grid. | | | The eight haploid strains you will study can be described as follows: |
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http://www.phys.ksu.edu/gene/bb3.html
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| | Meiosis |
| | Two gametes fuse to form a diploid zygote. | | | Organisms with seemingly quite different life cycles may vary in 3 aspects: | | | The spores divide by mitosis to produce haploid multicellular bodies (the haploid generation). |
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http://arnica.csustan.edu/principles/Lectures/09_Meiosis.htm
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| | Classnotes 9/30/04 |
| | Fertilization occurs when haploid sperm fuse with haploid ova | | | Where and when does all this take place in humans? | | | Meiosis occurs in the zygote, before offspring develop |
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http://www.msu.edu/course/lbs/144/snapshot.afs/f04/classnotes_093004.html
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| | 4_GB_21_Cla_Fun_J_Spr2003 |
| | A resistant, resting body adapted to survive adverse environmental conditions. | | | Single celled reproductive structure, usually an asexual haploid cell that divides by mitosis to produce new haploid individuals (could also be a sexual haploid cell that first must unite with another sexual spore to produce a new life stage); 2. |
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http://www.southtexascollege.edu/nilsson/4_GB_LectureNotes_f/4_GB_21_Cla_Fun_J_Spr2003.html
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| | Botany online: Classic Genetics - Mendel's Laws - Linkage Groups - Non-Mendelian Inheritance |
| | But in view of the chromosome theory, a plausible explanation can be given. | | | The results of these experiments became an important pillar of the chromosome theory and offered a way | | | Later studies performed by T. MORGAN and his collaborators on the fruit fly Drosophila melanogaster showed that the number of coupling groups corresponds to the number of chromosomes in a haploid set and that occasional exceptions were caused by the exchange of chromosomal pieces that occurred during the pairing of the homologous chromosomes in meiosis. |
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http://www.biologie.uni-hamburg.de/b-online/e10/10e.htm
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| | Microspore culture from oilseed rape haploid |
| | The six first isozyme systems (PGI, TPI, PGM, ACO 6-PGD and LAP) were studied according to the method described by Chèvre et al. | | | Cytological observations on meiotic behavior, female and male fertility of haploid plants are reported. | | | We observed that the oilseed rape varieties can be classified in two types according to their meiotic behavior at the haploid stage. |
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http://www.regional.org.au/au/gcirc/4/380.htm
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| | Biological life cycle :: Web Articles :: |
| | Two opposite types of gametes (e.g., male and female) from these individuals or cells fuse to become a zygote. | | | This way, the organism ends its diploid phase and produces several haploid cells. | | | The haploid organism becomes diploid through fertilizations of gametes, resulting in a zygote (see Reproduction). |
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http://www.webarticles.com/Science/Biology/Biological-life-cycle
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| | Botany online: Cytology, Mitosis, Meiosis - Meiosis |
| | A trained cytologist can infer from their structure to their identity. | | | During this process it emerges that each chromosome is built of two chromatids, so that the whole complex harbours four strands during the separation. | | | Here the chromatids are separated from each other. |
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http://www.biologie.uni-hamburg.de/b-online/e09/09b.htm
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| | Haploid Genetic Programming with Dominance (ResearchIndex) |
| | Dominance crossover is similar to the use of dominance in nature. | | | The haploid form contains all the information relevant to the problem, and is the structure that is widely used in evolutionary algorithms. | | | In nature, dominance is used as a genotype to phenotype mapping when an organism carries pairs (or more than one) chromosome, but here we use dominance on a haploid structure. |
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http://citeseer.ist.psu.edu/148827.html
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| | ARS Publication request: Genotypic and Environmental Effects on Gynogenic Haploid Induction in Onion |
| | S1 progenies of highly responsive plants segregated for both responsive and non-responsive progenies. | | | We studied frequencies of gynogenic haploid induction among progenies from crosses among responsive and non-responsive lines and the phenotypic correlations among haploid regenerants from parental plants and selfed progenies. | | | Based on treatments of over 7000 embryos in 2001, we concluded that application of 50 mM APM was superior to 25 or 75 mM, and treatments in liquid medium for 1 or 2 days were superior to the same treatments on solid media. |
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http://www.ars.usda.gov/research/publications/publications.htm?SEQ_NO_115=142198
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| | New Cereal Doubled Haploid Facilities in Western Australia and the status of the Barley Doubled Haploid Program |
| | Our first year in the new facilities has been somewhat experimental as we learn how the plants respond to their new growth conditions and cope with different pest and disease pressures. | | | Doubled haploids form a significant part of the barley program, comprising approximately 25% of the total program and over 40% of the Stage 2 material (re-selected, fixed lines). | | | Previous attempts at whole spike blending, in our laboratory, have been largely unsuccessful but a critical factor appears to be the use of refrigerated equipment and solutions during microspore isolation (Kasha et al., 2001). |
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http://www.regional.org.au/au/abts/2001/t4/broughton.htm
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| | Chimaeras of Drosophila melanogaster obtained by injection of haploid nuclei |
| | A technique for the easy production of haploid animals or tissues could have important applications. | | | We have now successfully designed such a technique by the production of chimaeras obtained by transplantation of haploid nuclei from a maternal effect mutant that produces haploid embryos. | | | We have used this technique to test the proposal of Jack and Judd |
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http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v287/n5778/abs/287143a0.html
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| | Characterization of alcohol-induced haploid filamentous growth. |
| | Ethanol, methanol, and isopropanol have no activity in this assay. | | | We have begun to analyze the genetic regulation of this phenotype and have found that mutations in the haploid pheromone response pathway and the TEC1 transcription factor, which are required for diploid filamentous and haploid invasive growth, also block alcohol-induced filamentation. | | | The GPA2 signaling pathway is not required for this phenomenon. |
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http://www.yeastgenome.org/community/meetings/yeast98/abshtml/091.html
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| | Tobacco Mapping Projects - North America |
| | REED, S.M., WERNSMAN, E.A., and BURNS, J.A. Aberrant cytological behavior in tobacco androgenic doubled haploid x parental cultivar hybrids. | | | Second cycle doubled haploid lines were hybridized with each other as well as the original cultivar, and the hybrids studied meiotically. | | | The doubled haploid lines were shown to have undergone nuclear DNA amplification without chromosome number changes, and the amplification was negatively related to the agronomic performance of the lines in field environments. |
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http://www.nal.usda.gov/pgdic/Map_proj/tobacco.html
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| | Ploidy - Wikipedia, the free encyclopedia |
| | Most somatic cells (body cells) of higher organisms are diploid. | | | For example, the euploid number of chromosomes in a human cell is 46. | | | Plants and other algae switch between a haploid and a diploid or polyploid state, with one of the stages emphasized over the other. |
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http://en.wikipedia.org/wiki/Haploid
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| | The Haploid Life Cycle |
| | Haploid life cycle is the most common in algae (without dikaryotic phase) and most fungi (with dikaryotic phase). | | | Another example is found in the fungi kingdom. | | | A general life history includes both a 1n stage and a 2n stage separated by meiosis and syngamy. |
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http://www.ucmp.berkeley.edu/glossary/gloss6/haploid.html
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| | TheRoleofMeiosisinSexualLifeCycles |
| | • By means of sexual intercourse, a haploid sperm reaches and fuses with a haploid ovum. | | | • Human sperm or ova have a haploid set of 23 different chromosomes, one from each homologous pair. | | | • Some haploid cells develop into gametes by mitosis. |
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http://users.rcn.com/rpohlman/theroleofmeiosisinsexualli.htm
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| | SparkNotes: The Life Cycle of Plants: Alternation of Generations |
| | The multicellular haploid plant structure is called the gametophyte, which is formed from the spore and give rise to the haploid gametes. | | | The haploid stage, in which a multicellular haploid gametophyte develops from a spore and produces haploid gametes, is the dominant stage in the bryophyte life cycle. | | | The zygote develops into the diploid sporophyte, which extends from the gametophyte and produces haploid spores through meiosis. |
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http://www.sparknotes.com/biology/plants/lifecycle/section1.html
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| | Lecture 2: Mitosis and Meiosis |
| | - involves alternation of diploid and haploid phases | | | spore – meiotically produced haploid cell that divides mitotically to produce a multicellular individual and does not fuse with another cell | | | Haploid (1N) – complement of chromosomes in which each type is present only once |
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http://www.colorado.edu/epob/epob2070stock/ArchiveFall2001/lecture02.html
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| | Alternation of Generations |
| | These single cells fuse to form the zygote which will develop into another diploid animal. | | | Whatever variation in details there may be from one organism to another, these two activities must occur alternately if sexual reproduction is to continue. | | | A haploid set of chromosomes, and hence a single set of genes (one genome), is sufficient to control cell function in these organisms (but not in most animals). |
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http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/Alternation.html
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| | 18. Character expressions of various dwarfing genes at haploid level |
| | The haploid and diploid lines showed significant correlations in most of characters examined. | | | Three haploid variants, ID-7b, ID-11a and ID-11b, were induced by anther culture. | | | It may be concluded that dwarfing genes produce similar effects on morphogenesis at both haploid and diploid levels. |
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http://www.gramene.org/newsletters/rice_genetics/rgn2/v2IV18.html
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| | Section 1 |
| | Cultured anthers may give rise directly to embryoids and then haploid plantlets, or callus may develop first. | | | In tissue culture, haploid microspore cells may develop into haploid plants. | | | The haploid embryos must be "rescued" and transferred to tissue culture to obtain haploid plantlets. |
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http://devalmont.0catch.com/coch.htm
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| | * Haploid - (Gardening): Definition |
| | alternation of generations -- Life cycle in which haploid and diploid generations alternate with each other. | | | Haploid cells formed by meiosis in plants; divide by mitosis to form several daughter cells, one of which functions as the egg cell. | | | A haploid moss plant can have both male and female reproductive structures, or both... |
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http://www.bestknows.com/gardening/haploid.html
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| | Encyclopedia article on Haploid [EncycloZine] |
| | Plants and other algae switch between a haploid and a diploid or polyploid state, with one of the stages emphasized over the other. | | | Each of these organisms produces haploid sex cells that can combine to form a diploid zygote. | | | Most fungi, and a few algae exist as haploid organisms. |
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http://www.encyclozine.com/Haploid
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| | Production of matroclinous maize haploids following natural and artificial pollination with a haploid inducer |
| | The delayed pollination is known to be one of the techniques of producing matroclinous haploids in various crops, including maize. | | | Mass production of haploids has become possible, mostly due to the development of efficient genetic inducers, which make it possible to obtain matroclinous haploids from practically any genotype (Tyrnov and Zavalishna, 1984; Zabirova, 1996; Chalyk, 1999). | | | Percentage of haploids after natural and artificial pollination. |
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http://www.maizegdb.org/mnl/76/69rotarenco.html
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| | Haploid Embryogenesis |
| | If these cells are put into culture, they can be induced to form embryos, which represents a major switch in their development. | | | The plants that arise from such cultures are initially stably haploid, but soon develop mixoploid regions, in which tracts of cells with double the chromosome number are found. | | | Some of the cultures that we have had in vitro for 15 years still produce embryos, but all recent ones have been dihaploid. |
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http://web.uvic.ca/forbiol/people/faculty/vonAderkas/hapemb.htm
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| | Evolution - A-Z - Diploid / haploid |
| | The condition of having two sets of chromosomes (and therefore two sets of the genes carried on them) is called diploidy. | | | In some species, such as yeast and fungi, organisms are permanently haploid. | | | Organisms having only one set of chromosomes are described as haploid. |
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http://www.blackwellpublishing.com/ridley/a-z/Diploid___haploid.asp
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| | PRODUCING AND MULTIPLICATION OF PYRUS COMMUNIS HAPLOID PLANTS |
| | The present paper shows the technique or tracing by indirect and direct methods and multiplication by grafting and in vitro of a haploid plant of Pyrus communis. | | | At the same time, the new homozigous forms are maintained from one to another generation by self cross-fertilization and their use in genetics selection it is necessary for having faster achievemnts in the desirable characters and features introduction by a stable gene transfer. | | | At the Fruit Research Institute Pitesti-Maracineni, Romania beginning with 1980 it has been studied the possibilities of producing pear haploids both by classical and androgenesis methods. |
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http://www.actahort.org/books/161/161_9.htm
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| | Jahrbuch-CD der MPG 2003 - Increased ploidy and KAR3 and S |
| | Meiotic telomere clustering occurred in diploid and haploid sir3 strains. | | | Using the haploid system, we further show that a bouquet forms at the kar3 SPB. | | | Elevated frequencies of bouquets in kar3 haploid meiosis suggest a role for Kar3p in regulation of telomere dynamics. |
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http://www.mpg.de/forschungsergebnisse/wissVeroeffentlichungen/archivListenJahrbuch/2003/05/publZIM149.html
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| | Medical Dictionary: Haploid - CureResearch.com |
| | Use of this site is subject to our TERMS OF USE. | | | Haploid: Having only one of each chromosome rather than a pair | | | Introduction: Normal cells have a pair of each chromosome. |
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http://www.cureresearch.com/medical/haploid.htm
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| | American Journal of Potato Research: A Genetic Model for Tuberization in Potato Haploid-Wild Species Hybrids Grown ... |
| | Inheritance studies can be carried out using these hybrids at the diploid level, avoiding the complexities associated with tetrasomic tetraploid genetics. | | | These haploids readily cross with most diploid Solanum species, resulting in fertile interspecific hybrids (Leue 1983; Hermundstad and Peloquin 1985a). | | | The objectives of this work are (1) to document high levels of tuberization in haploid-wild species hybrid populations, (2) to evaluate the genetic basis of tuberization in haploid-wild species hybrids grown under long-day conditions, and (3) to propose a genetic model for tuberization in haploid-wild species hybrids. |
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http://www.findarticles.com/p/articles/mi_qa4069/is_200409/ai_n9443330
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