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Lecture 34

BIOL 1000 Lecture 34: Lecture 34

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Biological Sciences
BIOL 1000
Kevin G.Scott

lc78 o Metaphase I – tetrads are aligned at metaphase plate (not individual chromosomes) Anaphase I – pairs of homologous chromosomes separate, but sister chromatids of each chromosome stay together At end of meiosis I, 2 haploid cells exists, but each chromosome still has 2 sister chromatids Meiosis II is identical to mitosis – it separates chromatids Difference***in meiosis each daughter cell only contains a haploid set of chromosomes Independent orientation of chromosomes in meiosis and random fertilization lead to varied offspring Offspring that result from sexual reproduction are highly varied Arrangement of homologous chromosomes at metaphase of meiosis I affects the resulting gametes  Whether the paternal or maternal chromosome in a homologous pair is closer to a given pole is a 50% chance For any species, the total number of combinations of chromosomes that meiosis can package into gametes is 2 (n is the haploid number)  23 The human haploid number is 23, 2 = 8 million possible chromosome combinations In humans, the random fusion of a single sperm with a single ovum during fertilization will produce a  zygote with any of 64 trillion (8 million x 8 million) combinations of chromosomes Homologous chromosomes may carry different versions of genes Recall: homologous chromosomes have genes for the same characteristics at corresponding loci  Homologous chromosomes can bear 2 different kinds of genetic information for the s
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