Along with having a variable number of toes, some kittens from Jake and Lucy's litter had a white spot on their nose. In fact, out of the 16 kittens, all 10 males had the white spot, but none of the 6 females had the white spot. Jake has a white spot on
his nose, but Lucy does not. What can you conclude from this information?
A) A sex-linked gene that controls the expression of the white spot is found on the Y chromosome.
B) A sex-linked gene that controls the expression of the white spot is found on the X chromosome.
C) The genes for the white spot and for polydactyly are linked.
D) The genes for the white spot and for polydactyly are not linked.
Answer: B
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