CAS BI 108 Chapter Notes - Chapter 11.5: Sister Chromatids, Meiosis, Prophase

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Two nuclear divisions that reduce the number of chromosomes to haploid number. Although the nucleus divides twice, the dna is only replicated once. Reduce chromosome number from diploid to haploid. Ensure that each of the haploid products has a complete set of chromosomes. Homologous chromosomes come together and then separate (but remember that. Preceded by s phase each chromosome is replicated two sister chromatids held the sister chromatids remain intact) together by cohesin proteins. At the end, two nuclei form, and each has half of the original chromosomes (one member of each homologous pair) Sister chromatids will then be separated during meiosis ii. Chromatid exchanges during meiosis i generate genetic diversity. Synapsis: homologous chromosomes pair by adhering along their lengths. This process lasts from prophase i to the end of metaphase i. Note: the four chromatids of each pair of homologous chromosomes form a tetrad.

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