BIOL359 Chapter Notes - Chapter 7: Silene Vulgaris, Allele Frequency, Genetic Drift
26 Apr 2013
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Chapter 7: mendelian genetics in populations ii: migration, genetic drift & nonrandom mating. Migration: the movement of alleles between populations gene flow transfer of allele from gene pools . Migration as a mechanism of evolution: migration changes the frequency of alleles, most important in preventing populations from diverging, e. g. Water snake of lake erie lives on mainland & islands. The color pattern is determined by a single locus with 2 alleles, banded allele is dominant over the unbanded allele. Mainland: most snakes are banded & island: most snakes are unbanded natural selection by predators. Island: unbanded individuals are more cryptic on island rocks higher survival rate. The homogenization of the red bladder campion (an insect-pollinated perennial wildflower) Geological uplift, new islands are constantly rising out of the water. Red bladder campion seeds transports through wind & water, the plant is among the first to colonize new islands. Young populations: vary in allele frequencies genetic drift .
