BIOL 103 Lecture Notes - Lecture 8: Blending Inheritance, Mendelian Inheritance, Chromosome Segregation
19 Apr 2017
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Document Summary
Biology week 8: quantifying variation, heterozygosity is a common way to measure variation, allele richness. Sustaining variation: mutations allows for more variation and creation of new alleles, varying pressures environmental changes can lead to new forms of selection. Trade off certain traits that are beneficial come at a loss for something else: balancing when heterozygotes have an advantage. Just after generation 33,000 population a-3 exhibited a sudden increase in fitness: not 1 or 2% but several fold: a key innovation a trait allowing colonization of a new resource or habitat. The inability to aerobically metabolize citrate is a diagnostic test for e. coli: was it a single, extraordinary, mutation event or was it a series of ordinary mutations by chance turning out to create a good team. Clines provide some of the most compelling evidence for environmentally mediated maintenance of genetic variation. The inverted sequence does not align with its standard homolog, stopping cross over.
