18.2 Vocab

Question 1

Directional Selection

Answer 1

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

Question 2

Stabilizing Selection

Answer 2

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

Question 3

Disruptive Selection

Answer 3

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

Question 4

Genetic Drift

Answer 4

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

Question 5

Bottleneck Effect

Answer 5

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

Question 6

Founder Effect

Answer 6

Change in allele frequencies as a result of the migration of a small subgroup of a population

Question 7

Genetic Equilibrium

Answer 7

Situation in which allele frequencies in a population remain the same

Question 8

Hardy-Weinberg Principle

Answer 8

Principle that states that alleles frequencies in a population remain constant unless one or more factors cause those frequencies to change

Question 9

Sexual Selection

Answer 9

When individuals select mates based on heritable traits

Question 10

Gene Flow

Answer 10

The movement of genes into or out of a population