Chap. 15 How Organisms Evolve

Question 1

Gene pool

Answer 1

Combo of all allele/gene in a population

Question 2

Allele frequency

Answer 2

how common an allele is in a population

Question 3

Genetic drift

Answer 3

Occurs through founder effect/population bottleneck. Changes frequency of gene variant in a pop. due to random chance.

Question 4

Population bottleneck

Answer 4

A reduction in size of population due to environmental events/human activity.

Question 5

Equilibrium population

Answer 5

When allele frequencies of a population’s gene pool no change through new/diff generations

Question 6

Mutations

Answer 6

Change in DNA sequence of an organism

Question 7

Gene flow

Answer 7

Movement of individuals/their genetic material to another population

Question 8

founder effect

Answer 8

loss of genetic variation when small set of large population establishes new colony

Question 9

Sources of genetic variability

Answer 9

Mutations, gene flow, genetic drift, crossing over, environmental variance

Question 10

survival of the fittest

Answer 10

Darwin;Organisms best adapted to their environment are most successful in survival/reproduction

Question 11

directional stablizing

Answer 11

natural selection favors one extreme trait

Question 12

stabilizing selection

Answer 12

natural selection favors moderate/intermediate trait

Question 13

Disruptive selection

Answer 13

natural selections favors both extremes against moderate