Selective and Environmental Pressures

Question 1

5 ways salection cna affect population variation

Answer 1

*stabilizing Selection
*directional Selection
*diversifying Selection
*frequency-dependent Selection
*sexual Selection

Question 2

increases or decreases biological traits within a population

Answer 2

Natural sselection

Question 3

an individual with ___ will provide more beneficial contributions to the gene pool of next generation

Answer 3

high evolutionary fitness

Question 4

compares an organisms fitness to the others in the population

Answer 4

Relative fitness

Question 5

a mode of natural selection in which a single
phenotype is favored, causing the allele frequency to continuously shift in
one direction

Answer 5

directional selection:

Question 6

a mode of natural
selection in which extreme values for a trait are favored over intermediate
values

Answer 6

*disruptive selection: (or diversifying selection)

Question 7

• a type of natural selection in which genetic
  diversity decreases as the population stabilizes on a particular trait value

Answer 7

stabilizing selection:

Question 8

*a process in which individual organisms or phenotypes
that possess favorable traits are more likely to survive and reproduce

Answer 8

natural selection:

Question 9

number, rate, or capacity of offspring production

Answer 9

fecundity:

Question 10

the average contribution to the gene pool of the next
generation that is made by an average individual of the specified genotype
or phenotype

Answer 10

Darwinian fitness:

Question 11

Natural selection only acts on the population’s

Answer 11

heritable traits:

Answer 12

beneficial
alleles, deleterious alleles

Question 13

type of selection where it often drives speciation

Answer 13

Diversifying or disruptive selection

Question 14

— is defined as a
situation where fitness is dependent upon the
frequency of a phenotype or genotype in a population.

Answer 14

Frequency-dependent selection

Question 15

is a mechanism of evolution in which members of one sex choose mates of the
other sex to mate with (intersexual selection), and
compete with members of the same sex for access
to members of the opposite sex (intrasexual
selection).

Answer 15

Sexual selection

Question 16

members of one sex choose mates of the
other sex to mate with

Answer 16

(intersexual selection)

Question 17

compete with members of the same sex for access
to members of the opposite sex

Answer 17

(intrasexual
selection).