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Labrador retrievers have the possible coat colors of black, brown, or golden. Two genes are involved...

Labrador retrievers have the possible coat colors of black, brown, or golden. Two genes are involved in the color. A gives black and is dominant to a. When aa occurs, the color is determined by B/b genes. B is dominant for brown, but only if no A is present. The combination bb is epistatic to the A locus and gives golden regardless of the A/a alleles. Indicate the color of the parents given. Then work out the crosses with Punnett Squares and give the phenotypes and their ratios or numbers.

  1. Aabb x aaBB

  1. AaBb x Aabb

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Answer #1

A_B_ = black

aaB_ = brown

A_bb = golden

aabb = golden

A.

Aabb = golden

aaBB = brown

Gametes aB
Ab AaBb black
ab aaBb brown

Phenotypic ratio = 1 (black) : 1 (brown)

2.

AaBb = black

Aabb = golden

Gametes Ab ab
AB AABb black AaBb black
Ab AAbb golden Aabb golden
aB AaBb black aaBb brown
ab Aabb golden aabb golden

Phenotypic ratio = 3 (black) : 4 (golden) : 1 (brown)

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