Unit 7

Question 1

Descent with modification

Answer 1

changes that have accumulated over time since 2 groups of the same species split

Question 2

Evolution

Answer 2

change in the genetic makeup of a population from one generation to the next

Question 3

Natural Selection

Answer 3

variations from previous generations that are best suited for growth and reproduction will continue disproportionally to the next generations

Question 4

Darwin’s Postulates

Answer 4

• members of a species vary from one another
• some phenotypic variation is heritable
• organisms always compete for resources
• variations that increase survival and reproduction will be passed down

Question 5

Convergent Evolution:

Answer 5

two different species evolve similar traits in response to similar selective pressures

Question 6

Effects of natural selection (x3)

Answer 6

stabilization: maintains status que, against extremes
directional: change in population from selective pressures
disruptive: acts against intermediates, favors extremes

Question 7

Intrasexual Selection

Answer 7

sexual selection focused on interactions between the same sex

Question 8

Intersexual Selection

Answer 8

sexual selection focused on interactions between the different sexes

Question 9

Somatic Mutations occur in__________ and are/are not passed down

Answer 9

nonreproductive cells
not passed down

Question 10

Germline Mutations occur in__________ and are/are not passed down

Answer 10

reproductive egg and sperm
are passed down