Exam 21: Microevolution: Genetic Changes Within Populations

The source of new alleles within a population is ____. ​

As adults, female ground finches on the Galápagos island of Daphne Major choose their mates according to characteristics they learned as young birds, a process known as ____. ​

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

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

In some studies that use observational rather than experimental data, investigators develop ____, which conceptually predict what they would see if a particular factor had no effect.

The Hardy-Weinberg principle describes how genotype frequencies are established in sexually reproducing organisms. ​

Like directional selection, sexual selection pushes phenotypes toward one extreme. ​

Natural selection that shifts the adaptation of an entire population is known as ____. ​

Genetic drift is most likely to lead to ____. ​

The sum of all gene copies at all gene loci in all individuals in a population defines a ____. ​

The gene locus governing flower color in snapdragons exhibits ____ because heterozygous individuals appear pink while homozygous individuals are either white or red. ​

Hybridization between different species is rare because it ____. ​

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

What is the most accurate definition of microevolution? ​

Inbreeding is primarily due to ____. ​

In humans, a diploid organism, an individual's genotype includes ____ of each autosomal gene. ​

Very small and very large human newborns are less likely to survive than those born at an intermediate weight due to ____.