Quiz 3 (9/29)

Question 1

Natural selection

Answer 1

a process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than do other individuals because of those traits
over time, natural selection can increase the frequency of adaptations that are favorable in a given environment
if an environment changes, or if individuals move to a new environment, natural selection may result in adaptation to these new conditions, sometimes giving rise to new species
individuals do not evolve, populations do over time

Question 2

Genetic variation

Answer 2

the difference in DNA among individuals or the differences between populations

Question 3

Mutation

Answer 3

change in an organisms DNA sequence (random)
better adapted: depends/not consistent
increases genetic variation

Question 4

gene flow

Answer 4

individuals or gametes move from one population to another
better adapted: depends/not consistent
effect on genetic variation varies (up or down)

Question 5

natural selection (adaptation and genetic variation)

Answer 5

individuals that are best adapted to the environment are best able to survive and reproduce
better adapted: yes!
effect on genetic variation varies (up or down)

Question 6

genetic drift

Answer 6

allele frequencies change at random
better adapted: depends / harmful alleles become fixed in your population
decreases genetic variation