NATS 1610 Lecture Notes - Synapsis, Sister Chromatids, Homologous Chromosome
21 Jan 2014
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Document Summary
L22 forming the living body meiosis. Meiosis involves two cell divisions and results in the formation of 4 haploid gametes: keeps chromosome numbers constant through generations. Increases genetic variability in the population through genetic recombination. Independent assortment: failure of chromosomes to separate during meiosis creates cell with extra or missing chromosomes. Meiosis divides the chromosomes number in half: germ cells diploid (2n) Each cell has a pair of homologous chromosomes. Undergo meiosis to produce haploid gametes: gametes haploid (1n, or just n) Each has one member of each homologous pair. Union of gametes restores diploid number in zygote. In meiosis i, each duplicated chromosome in the nucleus pairs with its homologous partner: homologous partners separate. The still-duplicated chromosomes are packaged in tow new nuclei: sister chromatids separate in meiosis ii. The now unduplicated chromosomes are packaged into four new nuclei. 2 cell divisions: results in 4 haploid daughter cells.
