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A hypothetical mutation in a single gene results in a “zombie” phenotype. A normal man and...

A hypothetical mutation in a single gene results in a “zombie” phenotype. A normal man and woman have 3 children – a zombie girl, a normal girl and a normal boy. The man has a normal sister and mother but his father is a zombie. The woman has a normal brother and both her parents are normal. Diagram a pedigree of this family and determine the mode of inheritance for the zombie condition. Once you have done so, determine the genotypes of all family members and indicate any unknown alleles with a question mark (?).

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Answer #1

From the given pedigree we can see that the trait is not present in all the generations. It means it is recessive.

We can also see that the trait is present in both male and female so it is autosomal.

We can conclude that the zombie phenotype is autosomal recessive.

Normal = AA, Aa

Affected = aa

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