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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?

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  1. anonymous
    • 4 years ago
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    We need to know the father's genotypes for coat color as well to know that.

  2. blues
    • 4 years ago
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    The 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?

  3. anonymous
    • 4 years ago
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    Wait, so we don't need to know the father's genotypes? And what OTHER QUESTION are you talking about??

  4. blues
    • 4 years ago
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    Yes, 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.

  5. anonymous
    • 4 years ago
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    Okay...?

  6. anonymous
    • 4 years ago
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    What exactly is calico?

  7. blues
    • 4 years ago
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    Calico 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?

  8. anonymous
    • 4 years ago
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    Um... I hadn't looked yet, sorry.

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