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anonymous
 4 years ago
A calico cat has a litter of 8 kittens: 1 yellow male, 2 black males, 2 yellow females, and 3 calico females. What are the genotypes for all the cats?
anonymous
 4 years ago
A calico cat has a litter of 8 kittens: 1 yellow male, 2 black males, 2 yellow females, and 3 calico females. What are the genotypes for all the cats?

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0We need to know the father's genotypes for coat color as well to know that.

blues
 4 years ago
Best ResponseYou've already chosen the best response.1The calico mother is heterozygous for yellow and black, as explained in your other question about the sex of the yellow kitten. We know that Dad gives a Y chromosome to all the male kittens. The only question is whether the X chromosome he gave to all the female kittens has a Yellow allele or a Black allele. You know has to be a yellow allele because some of the females (those that got the Yellow allele X from Mom as well) are yellow and the others (those that got the other possible female combination  a Black allele X from mom) have the heterozygous calico phenotype. Clear?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Wait, so we don't need to know the father's genotypes? And what OTHER QUESTION are you talking about??

blues
 4 years ago
Best ResponseYou've already chosen the best response.1Yes, we need to know the father's genotype. One of the chromosomes is a Y which he gives to all the male kittens. The other is an X with a yellow allele on it which he gives to all the female kittens. I explained about X inactivation in this response to the asker's other question: http://openstudy.com/study#/updates/4f31ec25e4b0c0e47961706c.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0What exactly is calico?

blues
 4 years ago
Best ResponseYou've already chosen the best response.1Calico is a mixed phenotype. It happens when female cats have two X chromosomes, one with a yellow allele on it and one with a black allele on it. Because no cell can have two active X chromosomes in it (or it will die), one of the two is "inactivated" at random and none of the genes on it are expressed. When the chromosome left active has a yellow allele, that particular hair will be yellow. When the chromosome left active has a black allele on it, that particular hair will be black. The mixed appearance is called calico. Was that not clear in my answer to the other question?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Um... I hadn't looked yet, sorry.
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