BIOL 190 Study Guide - Midterm Guide: Spermatogenesis, Sertoli Cell, Oogenesis
1 Nov 2016
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How many times is dna replicated in mitosis versus meiosis: dna is replicated twice in meiosis, but only once in mitosis. Why does meiosis need two cycles of division: meiosis needs two cycles of division in order to get the cell down to a haploid, rather than diploid, state. What is synapsis and when does it occur: a synapsis is te pairing of two homologous chromosomes. During what phase does crossing over occur: crossing over occurs in prophase i of meiosis. What is crossing over : crossing over is the mixing of homologous genes between chromosomes. Why is this important to evolution: this is important to evolution because it increases variation of genes in the offspring of an organism. What causes independent assortment and when does it occur: random alignment causes independent assortment and it occurs during metaphase. How was that calculated: an individual can produce 8. 4 million gametic combinations.
