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Lecture

13.3 Class Notes.docx

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Department
Biology
Course Code
BIO-0013
Professor
Michelle Gaudette

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October 22, 2013 Pre­Lecture: Even though sexual reproduction does not produce as many offspring as asexual reproduction,  sexual reproduction results in better survival and reproduction rates (the purifying selection  hypothesis) In environments where evolving pathogens are present, sexual reproduction by outcrossing will  be favored; the rate of outcrossing will increase in response to exposure to a pathogen Lecture: Disjoin – separate (disjunction = separation of homologs) Nondisjunction – when chromosomes don’t segregate properly • Aneuploid – with out a form (not haploid or diploid, etc.) o n+1, n­1 Two ways to produce aneuploidy gametes in humans: 1. Nondisjunction in meiosis I  ▯all four gametes are aneuploid 2. Nondisjunction in meiosis II  ▯only two gametes are aneuploid; two are normal Monosomy (only one chromosome) almost always results in mortality because there is not  enough information Trisomy is sometimes compatible with life (trisomy 21 = down syndrome) • Chromosomes 1
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