Gen. Genetics Quiz 2

The norm of reaction is the name given to the contribution of genetics to the variation of a quantitative trait .

False

In a mating between individuals with the genotypes IAIO X IOIO, what percentage of the offspring are expected to have the O blood type?

50%

Albinism, is a lack of pigmentation in humans. Two parents with normal pigmentation have an albino child.) What is the probability that their next child will be albino?

1/4

Albinism, is a lack of pigmentation in humans. Two parents with normal pigmentation have an albino child.) What is the probability that their next three children will be albino?

1/64

What is the probability of a carrier Dad and a carrier Mum, having a carrier child first and then an affected/ diseased child?

1/8

With incomplete dominance, a likely ratio resulting from a monohybrid cross would be ________.

1:2:1

Assume that a dihybrid cross (AaBb X AaBb) is made in which the gene loci are autosomal, independently assorting, and incompletely dominant. What phenotypic ratio would you expect from such a cross? Just provide the ratio, not the phenotypes.

1:2:1:2:4:2:1:2:1

A condition in which one gene pair masks the expression of a another gene pair is called ________.

Epistasis

The presence of more than two alternative forms of a given gene would be called ________.

Multiple alleles