Goats have a gene that controls whether or not the goat has a beard. The B 1 all

Question

Goats have a gene that controls whether or not the goat has a beard. The B1 allele of this gene causes this bearded trait. Note that the bearded trait is sex-influenced. Being bearded is the recessive phenotype on females, but being bearded is the dominant phenotype in males. The allele associated with beardlessness we'll call B2.

Part A - If a bearded female is crossed with a beardless male, what F1 offspring do you expect? Choose one answer.

A) All of the males will have beards, but none of the females will have beards B) 1/2 of the goats will have beards - this will be true of both males and female C) 3/4 of the females and 1/4 of the males will have beards (the others will be beardless) D) All of the females will have beards, but none of the males will have beards E) None of the offspring will have beards F) All of the offspring will have beards G) 3/4 of the males and 1/4 of the females will have beards (the others will be beardless)

Explanation / Answer

Answer: (a) all males will have beard, but none of the females will have beard.

Let the breaded females genotype be XB1 XB1 and XB2 Y

The genotype of the F1 offsprings will be XB1 XB2 (2 females) and XB1 Y (2 males).

Hence, both the females will be beardless as it is recessive in females and both males will be with beard as it is dominant in males.

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