Meiosis160-page9 - type of homologous chromosome The key to reducing chromosome number while maintaining all of the genetic information is the

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Meiosis and Life Cycles - 9 Anaphase I The homologous chromosomes are separated from each other and pulled toward opposite poles during Anaphase I. Replicated chromosomes are not affected during Anaphase I. The sister chromatids are still tightly bound to each other by their centromeres. The chromosome number is officially reduced at this time because each nucleus that will form at Telophase I will have half the number of chromosomes as the pre-meiotic cell. All of the chromosomes will be replicated. No sister chromatids have separated. No homologous chromosome pairs are present at the end of Anaphase I. Each cluster of chromosomes at the respective poles of the cell will have one of each
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Unformatted text preview: type of homologous chromosome. The key to reducing chromosome number while maintaining all of the genetic information is the pairing and separation of homologs. Anaphase I Telophase I Telophase I and Interkinesis • Typically two new nuclei are formed, each with one set of the homologous chromosomes • Cytokinesis will form two cells. Each chromosome is still replicated (which occurred in pre-meiotic interphase), and essentially the cells are just preparing for the second division. Some cells do not bother with cytokinesis here, or even form new nuclear envelopes, which will just have to be degraded during meiosis II, anyway....
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This note was uploaded on 12/29/2011 for the course BIO 151 taught by Professor Edwards during the Spring '10 term at SUNY Stony Brook.

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