Consider the three pedigrees at the top of the right column, all involving a single human...

Consider the three pedigrees at the top of the right column, all involving a single human trait.

(a) Which combination of conditions, if any, can be excluded?

dominant and X-linked

dominant and autosomal

recessive and X-linked

recessive and autosomal

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(b) For each combination that you excluded, indicate the single individual in generation II (e.g., II-1, II-2) that was most instrumental in your decision to exclude it. If none were excluded, answer “none apply.”

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(c) Given your conclusions in part (a), indicate the genotype of the following individuals:

II-1, II-6, II-9

If more than one possibility applies, list all possibilities. Use the symbols A and a for the genotypes.