Question

Stabilizing selective pressures result in _______.
a.
rapid, broad evolutionary changes
b.
limited evolutionary changes
c.
an increase in genetic diversity
d.
extreme gene distributions

Directional selection can be distinguished from disruptive selection by _______.
a.
the elimination of extreme variations of traits
b.
selection for two extreme variations of a trait
c.
the preservation of gene frequencies
d.
selection for one extreme variation of a trait

Answer 1

@kopserokopser I don't like the first question, but it is B. The reasons it is a bad question is because a stabilizing for can cause drastic changes, it is just that these changes all move towards a certain phenotype or genotype.

Disruptive selection causes separation in a population and usually results in speciation. Directional selection moves the entire population towards one geno/phenotype.