Evolution-Exam 2 Study Guide Solutions
genetic drift - ANSWERreduces genetic variation
results from random sampling
faster rate in a small pop (alleles become fixed)
genetic bottleneck - ANSWERcause genetic drift by drastically reducing population size
rare alleles are likely to be lost
ie el...
positive selection - ANSWER✔✔alleles that increase fitness
additive allele - ANSWER✔✔yields twice the phenotypic effect when two copiers are present at a give
locus than occurs when only one copy is present
not influenced by the presence of other alleles (no dominance)
reach fixation in population
directional selection - ANSWER✔✔one form is more favored than the other then shift to one direction or
another
variance = same
mean = will go up or down depending
what determines whether an allele becomes fixed in a population? - ANSWER✔✔dominance
initial allele frequency
selection coefficent
selection coefficient - ANSWER✔✔amount by which the fitness of the genotype differs from the other
genotype
how is variation maintained? - ANSWER✔✔gene flow
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