Abbreviated Cat Coat Color Genetics Chart Orange Pigmentation XB= black; XO= ora
ID: 36573 • Letter: A
Question
Abbreviated Cat Coat Color Genetics Chart
Orange Pigmentation
XB= black; XO= orange (heterozygotes show both colors)
White Patches
PP= mostly white; Pp= some white patches; pp= no white patches
Pigmentation
a) In cats, calico coloring (orange and black with white patches) is almost exclusively a female color pattern. This is because the orange pigment is coded for on the X chromosomes. The gene for white patches is on a separate chromosome. If an orange male cat with white patches (whose father had no white patches) mates with an all black female, what is the probability that they will have a calico kitten?
b) If a cat is homozygous recessive for the pigmentation gene, then the cat is always white, regardless of its genotype for orange pigment or white patches. If the two cats in the previous question were heterozygous for the pigment gene, what is the probability that a kitten will have the genotype coding for calico, yet will be phenotypically white (Hint: Use probabilities to determine answer).
c) One of the calico kittens from this mating pair turns out to be male. Briefly discuss how that is possible.
B= pigmentation; b= no pigmentation
Abbreviated Cat Coat Color Genetics Chart
Orange Pigmentation
XB= black; XO= orange (heterozygotes show both colors)
White Patches
PP= mostly white; Pp= some white patches; pp= no white patches
Pigmentation
a) In cats, calico coloring (orange and black with white patches) is almost exclusively a female color pattern. This is because the orange pigment is coded for on the X chromosomes. The gene for white patches is on a separate chromosome. If an orange male cat with white patches (whose father had no white patches) mates with an all black female, what is the probability that they will have a calico kitten?
b) If a cat is homozygous recessive for the pigmentation gene, then the cat is always white, regardless of its genotype for orange pigment or white patches. If the two cats in the previous question were heterozygous for the pigment gene, what is the probability that a kitten will have the genotype coding for calico, yet will be phenotypically white (Hint: Use probabilities to determine answer).
c) One of the calico kittens from this mating pair turns out to be male. Briefly discuss how that is possible.
B= pigmentation; b= no pigmentation
Explanation / Answer
a) 2:3
b) 1:2
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