Sapling Learning In a hypothetical breed of cats eye color i

Sapling Learning In a hypothetical breed of cats, eye color is controlled by three genes. The product converts a precursor molecule pigment. The product converts the precursor to blue pigment. Eyes that is visible through the are green, whereas eyes that contain neither pigment appear red because the unpigmented iris. The pigment precursor molecule is by the C-gene product. The following results were obtained in crosses with t cats that each contain a mutation in a single gene. Cross Eye oolor of female progeny Eye color of male progeny blue-eyed female yellow-eyed male green green yellow-eyed female xblue-eyed male green yellow blue-eyed female xred-eyed male green red-eyed female x ue-eyed male green In the pedigrees below, a shaded upper left quadrant indicates lack of A-gene product, a shaded lower left quadrant indicates lack of B-g product, and a shaded right half indicates lack of C-gene product. ene Determine the eye color of the Fimales and females produced in the matings indicated by the pedigrees. Eye color of Fifemales. Eye color of Fimales. green Pedigree 1

Solution

*** I am doing your first answer. Please post the rest separately.

A gene product gives yellow eyes.

B gene product gives blue eyes.

If C gene product is absent, then red eyes will be there.

If ABC all three gene products are there, then green eyes will be obtained.

Pedigree 1:

Mother is lacking “A” gene product, but contains B and C. So, eye color of mother should be blue.

Father is lacking B gene product, but contains A and C. So, eye color of father should be yellow.

It is not given that mother/father is homozygous or heterozygous for B/A genes. Let us consider that both of them are homozygous.

Then the entire progeny will be green.

Pedigree 2:

Mother is lacking the C gene product. So, mother is red. Father is lacking A and B gene product. So, it will also be red. The progeny (male and female) will take C gene from father, and A and B gene from mother; and should be green. Note: It is not mentioned whether mother/father is heterozygous or homozygous for the respective genes.

Pedigree 3: The mother’ eyes are red, because A and B gene products are not there while the father’s eyes are also red, because C is not there. So, the entire progeny will lack gene product C, and will be red.