lecture_15_notes

lecture_15_notes - Lecture 15 Meiosis (continued) Anaphase...

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Lecture 15 Meiosis (continued) Anaphase objective: move homologs apart chiasmata are disentangled and homologs are moved to opposite pole each homolog consists of a two chromatids Telophase as in mitosis. It tends to blur with the next division prophase. Cytokinesis as in mitosis. Some organisms skip it and go into the next division Phases of meiosis II objective: separate the chromatids Prophase, Metaphase, Anaphase and Telophase are as in mitosis Cytokinesis, as in mitosis Meiotic errors Non-disjunction is a common meiotic error. It involves failure to separate: homologs at anaphase I. Both homologs go to the same pole. They will eventually separate and continue meiosis. chromatids at anaphase II. Both chromatids go the same pole. They will eventually separate. gametes produced by non-disjunction have one more or one less chromosome they form zygotes with one more or one less chromosome these variants are called aneuploids. Ploidy refers to chromosome number. definitions: monosomy 21: a aneuploid with a single copy of chromosome 21 trisomy 21: a aneuploid with three copies of chromosome 21
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lecture_15_notes - Lecture 15 Meiosis (continued) Anaphase...

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