ch. 9

Question 1

Heritability (h^2)

Answer 1

A measure of the strength of the relationship between performance (phenotypic values) and breeding values for a trait in a pop.

Question 2

Heritability ( in the broad sense, H^2)

Answer 2

A measure of the strength of the relationship between performance (phenotypic values) and genotypic values for a trait in a pop.

Question 3

Repeatability (r)

Answer 3

A measure of the strength of the relationship between repeated records (repeated phenotypic values) for a trait in a pop.

Question 4

Contemporary group

Answer 4

A group of animals that have experienced a similar environment w/ respect to the expression of a trait. Contemporaries typically perform in the same location, are of the same sex, are of similar age, and have been managed alike.

Question 5

Contemporary Group Effect

Answer 5

An environmental effect common to all members of a contemporary group

Question 6

Trait Ratio

Answer 6

An expression of relative performance- the ratio of an individual’s performance to the avg. performance of all animals in the individual’s contemporary group.