Natural Selection

Question 1

variant forms of a gene

Answer 1

allele

Question 2

number of individuals in a population that exhibit a particular expression of a gene , usually expressed as a proportion

Answer 2

allele frequency

Question 3

proportions of individuals with each allele sum to

Answer 3

1 (100%)

Question 4

evolutions changes the population but not..

Answer 4

individuals

Question 5

full title of Darwin’s book where he described natural selection

Answer 5

On the Origin of species by means of natural selection of the preservation of favored races in the struggle for life

Question 6

Darwin’s reasoning can be broken down into # facts which lead to # inferences

Answer 6

5
3

Question 7

5 Facts from Darwin’s reasoning

Answer 7

1. species will reproduced exponentially with unlimited resources
2. natural populations normally exhibit stability

3 resources are finite

4. populations exhibit variation among individual
5. variation inheritable from parent to offspring

Question 8

3 inferences from Darwin’s reasoning

Answer 8

1. there is a struggle for existence among members of a population (intraspecific competition)
2. individuals within a population differ in survivorship
   3 over time, differential survival and reproduction changes in allele frequencies

Question 9

Fact 1:potential fertility
+
Fact 2: stable populations
+
fact 3: limited resources
=

Answer 9

inference 1 struggle for existence

Question 10

Fact 4: organisms vary
+
Fact 5: variation heritable
=

Answer 10

inference 2 : differential survival and reproduction

Question 11

inference 1 : struggle for existence
+
inference 2 : differential survival and reproduction
=

Answer 11

inference 3 : differential survival and reproduction leads to changes in populations over time

Question 12

Herron and Freeman’s 4 postulates of Natural Selection

Answer 12

1 individuals are variable
2variation is heritable
3. differential survival and reproduction
4 survival and reproduction is not random

Question 13

measurement determined by an individuals contribution to the gene pool of subsequent generations (the ability to survive and reproduce)

Answer 13

evolutionary fitness

Question 14

individuals possessing characteristics that enhance their ability to survive and reproduce in a particular environment are said to have a

Answer 14

selective advantage

Question 15

individuals not possessing characteristics that enhance their ability to survive and reproduce in a particular environment are considered to have a

Answer 15

selective disadvantage