Chapter 3

Question 1

What does natural selection sort on?

Answer 1

Does not directly sort on genotypes but rather phenotype dif among indivi in a population

Question 2

norm off reaction:

Answer 2

where gene’s effect on traits varies with env

Question 3

exaptation:

Answer 3

trait that serves 1 purpose today but served a dif func in the past

Question 4

What did Lenski’s exp find about evo?

Answer 4

natural selec can be predictable and repeatable process but the course maybe dif

Question 5

antagonistic pleiotropy:

Answer 5

propose same genes code for beneficial effects, also code for deleterious effects in other contexts

results in trade off bet. fitness under on condition and fitness under another. ex e. coli

Question 6

pleiotropic genes:

Answer 6

when genes affect more than 1 charac

Question 7

Under certain conditions, rate of adaptation is proportional to what?

Answer 7

rate of adaptation is proportional to supply of new variation available.

Even if there’s variation, selection may be unable to act on charac. if genes involve has effect on other charac

Question 8

Ex of exaptations?

Answer 8

1. feathers, that came before flight, used for thermoregulation
2. sutures in the skull

Question 9

Gene sharing:

Answer 9

protein that serves one func of the body is reunited to perform dif func at new location (92)