Download Ch 15.3 m definitions

Ch. 15.3 Vocabulary (M
definitions)
Directional Selection – type of
natural selection where
one
extreme is favored.
Disruptive Selection – type of
natural selection where
both
extremes are favored.
Genetic Drift – A quick change
in allele frequencies due
to a natural
disaster.
(likely to affect small
populations)
Gradualism – formation of a
species through slow and
steady change in a
species.
Hardy-Weinberg Principle –
states that change in a
population
won’t happen if five
conditions
can be met.
Postzygotic isolating mechanism
– a type of reproductive
isolation that occurs after
fertilization.
Prezygotic isolating mechanism
– a type of reproductive
isolation that doesn’t
allow fertilization.
Punctuated Equilibrium –
formation of a species through
periods
of rapid change in a
species.
Sexual Selection – type of
natural selection where a mate
(male) is
chosen based on his
appearance
alone not its ability to
survive.
Stabilizing Selection – a type of
natural selection where
the
average is the best.