Cats
This is what is happening when a tortoiseshell female is mated to either a red or a black male.
Because a tortie female is heterozygous, she can pass on either the gene for red or the gene
for non-red (black). The colour of the kittens depends on whether they are male or female and
what gene, if any, they inherit from the male.
ES FROM GENES FROM TORTOISESHELL GENES FROM GENES FROM TORTOISESHE
MALE FEMALE BLACK MALE FEMALE
O (red) o (non-red O (red) o (non-red
[black]) [black])
) OO Oo o (non-red Oo oo
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