Why has the dominant mutant allele for Huntington's disease been able to persist in human populations despite its
devastating effects?
a. It has a heterozygote advantage.
b. Its symptoms do not typically show until after the individual has had children.
c. Its effects are not expressed in heterozygous individuals.
d. Its effects are only expressed in homozygous recessive individuals.
e. Its effects are only expressed in homozygous dominant individuals.
b
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The process of fertilization joins male and female gametes ____
a. randomly b. that contain a greater number of paternal chromosomes
c. that contain a greater number of maternal chromosomes d. with the fewest mutations e. with the best adaptive traits
Small groups of individuals leave their home population and establish new settlements, mating only among themselves, are referred to as the
A. founder effect. B. bottleneck effect. C. artificial effect. D. natural effect. E. migration effect.
Solenopsis invicta, a species of fire ant, was introduced to the United States from ____
a. South America b. Canada c. Asia d. Africa e. Europe
In order to learn about the relationships among populations, we would need to examine the variation in DNA caused simply by ________.
A. mutation B. natural selection C. genetic drift D. geography