15.2 Mechanisms of Evolution

Question 1

gene pool

Answer 1

the alleles of a population’s genes

Question 2

allelic frequency

Answer 2

the % of any specific allele in the gene pool

Question 3

genetic equilibrium

Answer 3

the frequency of alleles remains the same over time

Question 4

genetic drift

Answer 4

the changing of allele frequencies by chance events

Question 5

stabilizing selection

Answer 5

favors average individuals in a population

Question 6

directional selection

Answer 6

favors one trait

Question 7

disruptive selections

Answer 7

favors both traits

Question 8

speciation

Answer 8

evolution of a new species

Question 9

geographic isolation

Answer 9

physical barrier that divides a population

Question 10

reproductive isolation

Answer 10

formerly interbreeding organisms can no longer mate or produce fertile offspring

Question 11

2 types of reproductive isolation

Answer 11

1) difference in genetic material
2) behavioral isolation

Question 12

punctuated equilibrium

Answer 12

speciation is fast with long periods of genetic equilibrium in between

Question 12

gradualism

Answer 12

species originate through slow changes in adaptations

Question 13

adaptive radiation

Answer 13

ancestral species evolve into an array of species to fit a number of diverse habitats

Question 14

divergent evolution