Chapter 4

Question 1

dominance

Answer 1

phenotype of the heterozygote is the same as the phenotype of one of the homozygotes

Question 2

incomplete dominance

Answer 2

phenotype of the heterozygote is intermediate between the phenotypes of the two homozygotes

Question 3

codominance

Answer 3

phenotype of the heterozygote includes the phenotypes of both homozygotes

Question 4

penetrance

Answer 4

the fraction of organisms expressing a phenotype among those that have a particular genotype

Question 5

expressivity

Answer 5

relates to the degree of expression within an individual

Question 6

epistasis

Answer 6

when one allele affects the expression of another at a different locus, the first gene is said to be epistatic to the second.

Question 7

complementation

Answer 7

can be used to determine whether mutations are at the same locus or at a different loci

Question 8

sex limited traits

Answer 8

type of sex influenced trait with zero penetrance in the second sex