In Rats, the P Gene Allele for Pigmentation (P) Is

question 2

Multiple Choice

In rats, the P gene allele for pigmentation (P) is dominant to the allele for albinism (p) . The B gene allele for black pigmentation (B) is dominant to the allele for cream pigmentation (b) . The pp homozygous recessive genotype is epistatic to any allele combination at gene B.
-Predict the phenotypic ratio of the F₂ progeny of a parental cross between a pure-breeding black rat and an albino that is also homozygous for cream.

• A)1 black: 2 cream: 1 albino
• B)9 black: 3 cream: 4 albino
• C)9 black: 7 albino
• D)12 black: 3 cream: 1 albino
• E)15 black: 1 albino

---

Definitions:

Well-structured Problem

A problem with clear objectives, known solutions, and definite criteria for evaluating solutions.

Ill-structured Problem

A problem that lacks a clear path to a solution and may not have a definitive answer, often requiring creative or critical thinking to resolve.

Well-structured Problem

A problem that has a clear goal, obvious solution paths, and a definite solution.

Existing State

refers to the current condition or status of a system, process, or situation before any changes are made.