In cats an X-linked pair of alleles, B and b, control
color of fur. The alleles are incompletely dominant:B
produces black, b produces yellow, and Bb
produces tortoiseshell.
(a) A yellow cat had a litter of two tortoiseshell and
one yellow kittens. What is the sex of the yellow
kitten?
(b) A tortoiseshell cat brings home a litter of black,
yellow, and tortoiseshell kittens. The color of
which sex would tell you the color of the tomcat
that produced them?
(c) A yellow male is crossed with a tortoiseshell
female. If the female has all male kittens in her
litter of four, what color(s) would they be? What will be an ideal response?
Answer: (a) male, (b) female, (c) 1/2 yellow 1/2 black
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