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

Black dogs = A_B_

Brown dogs = aaB_

Yellow dogs = A_bb and aabb

Explanation:

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?

Gene A determines colored pigment.

Gene B ensures that the colored pigment is deposited.

Two heterozygous black laborador retrievers were crossed.

AaBb   x   AaBb

Progeny

9 A_B_

3 A_bb

3 aaB_

1 aabb

Since there were 9 black, 3 brown and 4 yellow dogs, the possible genotype of the different colors are:

Black dogs = A_B_

Brown dogs = aaB_

Yellow dogs = A_bb and aabb

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.