Introduction to Genetic Analysis 99

Introduction to Genetic Analysis 99 - (frst two panels)...

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98 Chapter 3 The Chromosomal Basis of Inheritance Mitosis in a haploid cell Meiosis Chromatid formation Chromatid formation Chromatid formation Mitosis Alignment on equator Mitosis Alignment on equator Meiosis Pairing of homologs at equator (tetrad) Chromatid segregation Chromatid segregation Chromosome segregation End of first division End of second division Sex cells and and and and 1 2 A 1 2 a S Phase S Phase S Phase Mitosis in a diploid cell Daughter cells All Daughter cells All / Figure 3-35 DNA and gene transmission during mitosis and meiosis in eukaryotes. S phase and the main stages of mitosis and meiosis are shown. Mitotic divisions
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Unformatted text preview: (frst two panels) conserve the genotype of the original cell. In the third panel, the two successive meiotic divisions that occur during the sexual stage of the life cycle have the net effect of halving the number of chromosomes. The alleles A and a of one gene are used to show how genotypes are transmitted during cell division. 44200_03_p73-114 3/3/04 1:48 PM Page 98...
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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