This pedigree diagrams an X-linked gene. The individual indicated by the question mark is _____ for the gene.

Question

Quizplus · Accepted Answer

Since the gene is X-linked, the question mark can either be a male who inherited the gene from his carrier mother (making him a heterozygous carrier) or a female who inherited the gene from both her carrier mother and affected father (making her affected). Without further information about the sex of the question mark or their parents, we cannot determine if they are affected or a carrier. Therefore, the best choice is A) heterozygous.

This Pedigree Diagrams an X-Linked Gene