Biology 1001A Study Guide - Midterm Guide: Meristem, Blood Transfusion, Population Bottleneck
30 Mar 2017
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Variation means differences in double stranded dna sequence. Origin is inherent in chemistry of dna, enzymology of replication/repair/recombination/cytoskeleton. Can be influenced by physical chemical, biological agents/conditions. Origin is undirected wrt survival value (sexual recombination can be a response to a rapidly changing environment to generate diversity) Origin is not randomly distributed around genome (not random, but cannot be predicted) Only germ-line variation is available to selection: mechanisms contributing to genetic diversity. Variability increases the chance that at least some offspring will have combinations of alleles that will be successful in surviving and reproducing in changing environment. Disassembles and disappears after crossing over (chiasmata) is complete (end of pi: cohesin: protein complex - regulates separation of sister chromatids during cell division, pairing for recombination: occurs front to back, not side to side. Ensures all non-sister chromatids are close enough to each other for recombination: role of distance separating genes & likelihood of recombination between them:
