Exam 21: Microevolution: Genetic Changes Within Populations

The Hardy-Weinberg principle specifies the conditions under which a population of diploid organisms achieves ____.

Mendel inferred the genetic basis of ____, such as flower color in peas, by crossing plants with different phenotypes.

Genetic drift is nonselective and therefore does not contribute to microevolution.

If a lethal mutation occurs in a dominant allele, ____ individuals will die from its effects.

Natural selection acts upon the ____ to create microevolutionary change.

Any product of natural selection that increases the relative fitness of an organism in its environment is called a(n) ____.

The gallmaking fly larvae feeds on goldenrod plants, causing the plant tissue to produce a growth deformity called a gall. How does parasitism of small galls by wasps and predation of fly larvae in large galls by birds result in a higher percentage of medium-sized galls?

Stabilizing selection reduces genetic and phenotypic variation and increases the frequency of intermediate phenotypes

How can harmful alleles persist in a population despite natural selection?

In humans, ____ mutations cause forms of Ehlers-Danlos syndrome, a disruption of collagen synthesis that may result in loose skin or weak joints.

A group of individuals of a single species that live together in the same place and time is referred to as a(n) ____.

Natural selection results in organisms perfectly adapted to their environments.

The contribution an individual makes to the gene pool of the next generation compared to the contributions of other individuals is called ____.

Which of the following evolution-related events is in the correct cause-and-effect sequence?

With frequency-dependent selection, highest mortality can be expected in ____.

John G. Swallow and his colleagues used ____ techniques to demonstrate that the observed differences in activity levels of house mice have a genetic basis.

Microevolutionary change resulting from the differential survivorship or reproduction of individuals with different genotypes is known as ____.

When male moose engage in their annual battles, butting heads with their oversized antlers, they are exhibiting ____ selection.

When a few individuals colonize a distant locality and start a new population, the allele frequencies of the gene pool may be different than those in the original population. This is known as ____.