Biology I-2: Chapter 17 Vocab

all the genes, including all the different alleles for each gene, that are present in a population at any one time

• gene pool
• molecular clock
• temporal isolation
• single-gene trait
• allele frequency

number of times that an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene

• allele frequency
• gene pool
• molecular clock
• polygenic trait
• single-gene trait

trait controlled by one gene that has two alleles

• single-gene trait
• allele frequency
• gene pool
• directional selection
• polygenic trait

trait controlled by two or more genes

• polygenic trait
• single-gene trait
• allele frequency
• stabilizing selection
• directional selection

form of natural selection in which individuals at one end of a distribution curve have higher fitness than individuals in the middle or at the other end of the curve

• directional selection
• polygenic trait
• single-gene trait
• disruptive selection
• stabilizing selection

form of natural selection in which individuals near the center of a distribution curve have higher fitness than individuals at either end of the curve

• stabilizing selection
• directional selection
• polygenic trait
• genetic drift
• disruptive selection

natural selection in which individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle of the curve

• disruptive selection
• stabilizing selection
• directional selection
• bottleneck effect
• genetic drift

random change in allele frequency caused by a series of chance occurrences that cause an allele to become more or less common in a population

• genetic drift
• disruptive selection
• stabilizing selection
• founder effect
• bottleneck effect

a change in allele frequency following a dramatic reduction in the size of a population

• bottleneck effect
• genetic drift
• disruptive selection
• genetic equilibrium
• founder effect

change in allele frequencies as a result of the migration of a small subgropup of a population

• founder effect
• bottleneck effect
• genetic drift
• Hardy-Weinberg principle
• genetic equilibrium