Two heterozygous round yellow seeded pea plants are intercrossed. In the progeny, the trait for seed shape will segregate in the ratio:

(1) 1 : 1

(2) 3 : 1

(3) 1 : 1 : 1 : 1

(4) 9 : 3 : 3 : 1

Given the parents AABBCc × AabbCc, assume simple dominance and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?

In a cross between AABB X aabb, the ratio of F₂ genotypes between AABB, AaBB, Aabb and aabb would be:

Which of the following terms best describes when the phenotype of the heterozygote differs from the phenotypes of both homozygotes?

A man of blood group A marries a woman of AB blood group. Which type of progeny would indicate that man is heterozygous A?

The gene for eye color in a certain organism has seven alleles. How many genotypic combinations are possible?

In chickens, gene R produces a rose-shaped comb, gene r produces a single comb, gene P produces pea-shaped comb and gene p produces a single comb. When P and R are both present in the genotype, the comb is walnut shaped. Two chickens with genotype RrPp are intercrossed. What will be the ratio of Walnut shaped, Rose shaped, Pea shaped and single comb progeny respectively:

Two pure lines of corn have mean cob lengths of 9 and 3 inches respectively. The polygenes involved in this trait all exhibit additive gene action. Crossing these two lines is expected to produce a progeny with mean cob length [in inches] of:

Diseases that are caused by the malfunction of a pleiotropic gene are:

Out of a pair of monozygotic twins, one develops hare lip and the other does not. This can be an example of the genetic phenomenon of: