X Linked Genetics in the Calico Cat - KEY

Calico is a coat color found in cats, which is caused by a SEX-LINKED, CODOMINANT allele.
B = black, R = orange, and BR = calico.

The following genotypes are possible;

Female cats can be black XBXB, orange XRXR, or calico XBXR
Male cats can be black XBY or orange XRY

Show each of the crosses below and include the phenotypic ratios of the offspring.

1. A black male crossed with an orange female

XBY and XRXR

All female cats are calico, male cats are orange

2. An orange male crossed with a calico female

XRY and XBXR

1/4 female calico, 1/4 female orange, 1/4 male black, 1/4 male orange

3. A black male crossed with a black female

XBY and XBXB - all offspring are black

4. An orange male crossed with an orange female - all offspring are orange

5. A black male crossed with a calico female

XBY and XBXR

1/4 female calico, 1/4 female black, 1/4 male black, 1/4 male orange

**If you are a cat breeder, what type of parents should you choose to have the MOST number of calico kittens?

two possible ways, the color of the male doesn't matter that much, but the female should be either the opposite color of the male (black x orange), or the female can be calico - both scenarios will yield 1/4 calico kittens, female of course