In laborador retrievers, pigment color is influenced by two genes. Gene A determines the type of pigment produced and gene B affects whether the pigment gets deposited in the hair shaft. If two heterozygous black laborator retrievers were crossed and offspring were produced in a ratio of 9 black dogs to 3 brown dogs to 4 yellow dogs, what are the genotypes of the offspring?

AaBb, AABb, AaBB, AABB, Aabb, aaBb, AAbb, aaBB, aabb.

Explanation:

Gene A conditions pigment type.

Gene B determines whether the pigment of A will be deposited.

Heterozygous black individuals will have the genotype AaBb.

Two heterozygous black individuals were crossed:

AaBb   x   AaBb

Progeny:

4 AaBb - Black

2 AABb - Black

2 AaBB - Black

1 AABB - Black

2 Aabb - yellow

2 aaBb - yellow

1 AAbb - brown

1 aaBB - brown

1 aabb - brown

Hence, the genotypes of the offspring are:

AaBb, AABb, AaBB, AABB, Aabb, aaBb, AAbb, aaBB, aabb.

See the attached image for the Punnet's square result of the cross.

identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.v

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