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The following pedigree shows the inheritance pattern of a trait. From the following, select the possible mode of inheritance and the probability that the daughter in generation III will show the trait. a) X-linked recessive, probability is 1/2 b) X-linked recessive, probability is 1/4 c) Autosomal recessive, probability is 1/2 d) Autosomal recessive, probability is 1/3

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This question is from an examination. The answer key says c) is the answer. I get how c) could be the answer, but I also think a) is a possibility. Please tell me if a) is possible or not.

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No, it cannot be X-linked recessive, because in this case, the right-most son would have a trait.

Inheritance

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