Fluffernutter labradors are identical to Earth labradors in every way, except th

Question

Fluffernutter labradors are identical to Earth labradors in every way, except that they grow marshmallows instead of fur. The three possible types of marshmallow skin are:

a. Black (tastes like licorice);
b. Chocolate (tastes like chocolate);
c. Yellow (tastes like vanilla).

There are two genes that control for this phenotype, acting in a recessive epistatic manner. The two-locus genotypes that correspond to the phenotypes are:

A_B_ (codes for Licorice);
aaB_ (codes for Chocolate);
__bb (codes for Vanilla).

Note that the alleles at the two loci are:

A (dominant), a (recessive), (Locus 01)
B (dominant), b (recessive). (Locus 02)

If two doubly heterozygous Licorice Labs mate, what is the expected proportion of Licorice fluffernutter progeny?

A. 3/16.

B. 3/4.

C. 1/2.

D. 9/16.

E. 1/8.

Explanation / Answer

1) Fluffernutter labradors are identical to Earth labradors in every way, except that they grow marshmallows instead of fur. The three possible types of marshmallow skin are Yellow (tastes like vanilla).

Hence 1/2 is correct.

Hence otion (c) is correct.

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