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When an organism has more than 10 fingers or toes, the condition is known as polydactylism. although polydactylism is rare, it is a dominant trait. if two cats that are heterozygous for polydactylism mate and have a litter with a total of 12 kittens, how many of them would you expect to have more than 10 fingers or toes?

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If we say that heterozygous cat has a phenotype Aa for the polydactyl gene locus then :
F1:  Aa   x   Aa

F2: AA  Aa  Aa aa This means that the proportion is 3:1 for the polydactyly phenotype (only aa is recessive and does not have polydactyly).
 Of the total 12 kittens, 9 will have polydactyly and 3 won’t.