Classic Genetics

Question 1

incomplete dominance (blending)

Answer 1

2 genes create an intermediate phenotype

Question 2

pleiotrophy

Answer 2

1 gene controls many phenotypic traits

Question 3

polygenic inheritance

Answer 3

multiple genes control 1 trait

ex: eye color

Question 4

epistasis

Answer 4

the expression of 1 gene is modified by another gene

ex: bombay phenotype

Question 5

Genetic drift – founder effect

Answer 5

a new population is established by a small group of individuals, genetic variation decreases

Question 6

Genetic drift – bottleneck effect

Answer 6

a sharp decrease in population due to an environmental event. will decrease genetic variation

Question 7

Disruptive selection

Answer 7

extreme phenotypes are favored, allele distribution is disrupted

Question 8

stabilizing selection

Answer 8

Extreme phenotypes are selected against, intermediate phenotypes are favored

Question 9

directional selection

Answer 9

a single phenotype is favored

Question 10

heterozygote advantage

Answer 10

hetero have a higher degree of fitness

Question 11

codominance

Answer 11

1 trait is controlled by multiple alleles

ex: ABO blood