A random change in allele frequencies over generations brought about by chance.

• genetic drift

• gene flow

Emigration

• genetic drift

• gene flow

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

In the 1800s, hunters killed all but twenty of a large population of northern elephant seals

• genetic drift

• gene flow

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-3

When allele frequencies change due to individuals leaving a population

• genetic drift

• gene flow

Founder effect and bottlenecks are two extreme cases

• genetic drift

• gene flow

Blue Jays introduce new alleles to oak forests as they make hundreds of round trips carrying acorns from oak trees a mile away to new soil in their home territory for winter.

• genetic drift

• gene flow.

Tags

NGSS.HS-LS2-6

May result when heterozygotes are selected AGAINST.

• directional selection

• stabilizing selection

• disruptive selection

Tags

NGSS.HS-LS4-4

Phenotypic forms at both ends of the range are favored and the intermediate forms are selected against.

• directional selection

• stabilizing selection

• disruptive selection

Tags

NGSS.HS-LS4-4

Type of selection that was seen in the beak size of the ground finch during times of drought

• directional selection

• stabilizing selection

• disruptive selection

Tags

NGSS.HS-LS4-4

Type of selection seen where both sickle cell anemia and malaria are prevalent

• directional selection

• stabilizing selection

• disruptive selection

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4