1. Tardigrade
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  4. This pedigree is of a rare trait, in which children have extra fingers and toes. Which one of the following patterns of inheritance is consistent with this pedigree?

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Q. This pedigree is of a rare trait, in which children have extra fingers and toes. Which one of the following patterns of inheritance is consistent with this pedigree?Biology Question Image

AIIMSAIIMS 2009

Solution:

$Y$-linked disorders are caused by mutations on the $Y$-chromosome. Because males inherit a $Y$-chromosome from their fathers, every son of an affected father will be affected. Because females inherit an $X$-chromosome from their fathers, female offspring of affected fathers are never affected.