3. In domestic cats, orange (o) fur is dominant to black (o) and short hair (s)

Question

3. In domestic cats, orange (o) fur is dominant to black (o) and short hair (s) is dominant to long hair (s). Suppose that Desi, a male with a long black coat, mates with Lucille, a female with a short orange coat. They have 9 kittens of the following phenotypes: 3 males with short orange fur 2 males with long orange fur 2 females with short coats with patches of black and orange 3 females with long coats with patches of black and orange A. What are the genotypes of Desi and Lucille? If either trait is sex-linked, that should be denoted in the genotype. (Clearly distinguish capital and lowercase letters in your answer!) B. what accounts for the patches of orange and black fur in the female kittens? c. Suppose that one of the orange, short ha males (from above) mates with one of his patched, long hair sisters. What offspring are possible? Give genotypes, phenotypes and expected proportions of each. (Draw a Punnett square or a branch diagram to show the answer.)

Explanation / Answer

{Hi, I am answering part 1 and 2 asked by you. I hope it helps. Thanks ]

1. The genotype of parents are:

Desi= Male Long blaxk coat = ssoo( all recessive), while

Lucille = Female short orange coat = S_O_ ( _ because even a single dominant allele can give rise to dominant phenotype. The other can be S or s, O or o).

2. If the "patches" are involved and both phenotypes are being displayed, codominance is usually present. Therefore, coat color is likely to be a codominant trait. In a codominant trait, both phenotypes are expressed.

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