Chapter 20 - Population Genetics

Natural selection

Natural selection

________, gene flow, and genetic drift are the three fundamental factors that drive changes in allele frequencies in a population.

Gene flow

________ in plants can occur by pollen transfer (through wind or animals) into new plant populations.

Random mating Random mating

________ reduces the likelihood of sexual selection modifying allele frequencies.

Godfrey Hardy

________ and Wilhelm Weinberg, both scientists, created equations that explain these stable populations.

random loss of alleles

The ________ in a population is referred to as genetic drift.

Mutations

________ are a random process, but natural selection, which operates on the phenotypes that arise from those ________, is not.

genetic diversity

Population A was created by only individuals who possessed the allele indicated by white squares, resulting in less ________ than existed in the initial population.

transmission of alleles

The ________ from one population to another is referred to as gene flow.

bottleneck effect

The ________ is one probable source of genetic drift.

genetic drift

A shift in allele frequencies (induced by ________) is significantly more frequent in small populations.

removal of members

The introduction of additional people, or the ________ from a population, may alter the allele frequencies.