Calico cats aka money cats or the state cat of Maryland are

Calico cats (aka \"money cats\" or the state cat of Maryland) are the result of a gene located on the X- chromosome encoding a hair pigment that occurs as two variants: black or the mutant orange. Calico coat patterns appear as patches of black, orange and white. The white patches result from another gene on an autosomal chromosome that suppresses the transcription of the orange or black pigment. Leaving aside the white patches of fur, what percent of the pigmented fur is black in a female cat that is heterozygous for the orange mutation? Leaving aside the white patches of fur, what percent of the pigmented fur is black in a female cat that is homozygous for the orange mutation? Leaving aside the white patches of fur, what percent of the pigmented fur is black in a male cat whose maternal X carries the orange mutation?

Solution

a) for a female cat that is heterozygous for the orange mutation it will have 100% of pigmented fur is black

b) for a female cat that is homozygous for the orange mutation it will have 0% of pigmented fur is black

c) for male cat if the maternal x carries the orange mutation it will have 0% of pigmented fur is black