Exam 21: Microevolution: Genetic Changes Within Populations

Research by Malte Andersson suggests the long tail feathers of male African widowbirds are a product of ____ selection because females are more strongly attracted to males with long tails than to males with short tails.

Genetic drift can eliminate alleles from a population more quickly than natural selection.

The development of penicillin-resistant bacteria represents an example of ____. ​

Genetic drift will have a progressively larger impact on allele frequencies in a population as ____. ​

A scientist could test how the traits of desert plants are adaptive by ____. ​

Natural selection is a quick and effective way of eliminating harmful alleles from the population.

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

According to the Hardy-Weinberg principle, microevolution occurs when ____. ​

Natural selection acts upon the ____ to create microevolutionary change. ​

Genetic variations that confer no apparent selective advantage or disadvantage in a particular environment are said to be selectively ____. ​

For an autosomal gene locus, there are ____ possible genotypes and ____ possible alleles.

With ____ selection, the frequency of the mean phenotype decreases while the frequencies of extreme phenotypes increase. ​

How does gene flow introduce novel genetic variants into populations? ​

Bacterial resistance to penicillin began to appear ____. ​

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 ____.

The high incidence of Ellis-van Creveld syndrome among the Old Order Amish population is caused by ____. ​