Discussion in 'Biology' started by Gogypiko, Sep 18, 2020.
List three significant differences between meiosis 1 and meiosis 2
In the first stage of meiosis, called the reduction division, the members of each pair of homologous chromosomes lie side by side and crossing over (Chiasma) occurs. Each member of the pair then moves away from the other toward opposite ends of the dividing cell, and two nuclei, each with the haploid number of double-stringed chromosomes, are formed. Thus at the beginning of the second meiotic sequence, called the equational division, each cell nucleus contains one chromosome from each homologous pair and each chromosome is of two strands that are identical (except where crossing over has occurred). Then the chromosomes separate into their single strands which move toward opposite ends of the dividing nucleus. The result of meiotic division is four cells, each haploid, with one chromosome of each pair. So, the difference is 1. Presence of crossing-over at meoisis I 2. Homologous chromosome moves to opposite poles (sister chromatids remain attached) in Meoisis I but sister chromatids separate in Meiosis II 3. Chromosome compliment is reduced from 2N (diploid) to 1N (haploid) in Meiosis I — Reduction division but Meiosis II is a mitotic division of haploid cells produced in Meiosis I 4. No interphase between Meiosis I and Meiosis II
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