[GENOME 361] - Final Exam Guide - Everything you need to know! (23 pages long)

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A set of chromosomes of a typically sexually-reproducing organism consists of autosomes, which are common to all members of the species, and sex chromosomes, which are differently allocated according to the sex of the individual. Events through the first cell division of meiosis. Division i of meiosis does not produce cells with a haploid amount of dna. Because the sister chromatids behave as a unit, each daughter cell of this division inherits two copies of one of the two homologs. The two copies are identical except where genetic recombination has occurred. Occasionally during meiosis, chromosomes fail to separate normally into the four haploid cells, a phenomenon known as nondisjuction. In such abnormal meiotic divisions some of the haploid cells that are produced lack a chromosome, while others have more than one copy. The resulting gametes form abnormal embryos, most of which die.