BIO 1201 1nd Edition Lecture 14 Outline of Last Lecture I.Sexual ReproductionII.MeiosisIII.Why aren’t siblings identical?Outline of Current Lecture IV.Problems during meiosisV.Comparing meiosis and mitosisCurrent LectureI. Problems during meiosis: can lead to changes in the number or structure of chromosomesa.Nondisjunction: chromosomes don’t separate properly—can result in aneuploidy or polyploidy (3n)i.Usually embryonic lethalii.Down Syndrome: extra 21st chromosomeiii.Turner Syndrome: female with one X chromosomeiv.Klinefelter Syndrome: male with two X and one Y chromosomeb.Changes in chromosome structure; occurs during cross-oversi.Deletions: region of chromosome is lostii.Duplications: chromosome with repeated genesiii.Inversions: genes in chromosome are in wrong orderThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.iv.Translocations: different (not homologous) chromosomes cross-over1.Can cause leukemiaII.Comparing mitosis and meiosisa.Mitosis: two copies of one celli.One diploid cell divides once to produce two identical cells that are 2nb.Meiosis: two cell divisions that produce 4 haploid cellsi.One diploid cell divides twice to product four cells that are
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