Lecture_6,_20081

Lecture_6,_20081 - Announcements Exam covers through...

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Announcements Exam covers through meiosis, including crossing over and aneuploidy
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Meiosis: Gamete production in diploid organisms Chiasmata in Prophase I
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Meiosis Occurs in reproductive cells of diploid organisms Function? To reduce the genetic information in cells from 2n to 1n So that after fertilization , the offspring will be 2n like their parents
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Chromosomes have to be replicated before meiosis, just like before mitosis Here we show 2 pairs of homologous chromosomes (2n = 4); Each chromosome consists of 2 chromatids
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Meiosis has 2 stages Meiosis I: = reduction division separation of homologous chromosomes Meiosis II: separation of chromatids
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The phases of Meiosis Meiosis I: Prophase I: Homologous chromosomes pair Metaphase I Anaphase I Separation of chromosomes Telophase I Then a brief interphase, but without replication Meiosis II Prophase II No pairing of chromosomes Metaphase II Anaphase II Separation of chromatids Telophase II Ends with production of 4 haploid gametes
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I’ll run through it in slides Then I’ll draw it on the board for 2n = 4
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Lecture_6,_20081 - Announcements Exam covers through...

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