Question

The accompanying figure is a pedigree of a fairly common human hereditary trait in which the boxes represent males and the circles represent females. Shading symbolizes the abnormal phenotype.

Given that one gene pair is involved:
a) Is the inheritance pattern X-linked or autosomal, recessive or dominant?
b) Give the genotype of each individual in the pedigree. If more than one genotypic possibility exists, present all possible alternatives.

Answer

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