Examine the figure below of a pedigree that diagrams an X-linked gene.
The genotype of the individual next to the question mark is

Question

Examine the figure below of a pedigree that diagrams an X-linked gene. 
The genotype of the individual next to the question mark is

Quizplus · Accepted Answer

The gene being diagrammed is X-linked, therefore it follows a pattern of inheritance that is different from autosomal genes. The individual next to the question mark is the daughter of an affected male, which means she inherited the X-linked disease allele from her father. Since females have two X chromosomes, the individual next to the question mark could either be heterozygous (XaX^A) or homozygous (XaXa) for the X-linked disease allele. However, since the father is affected, he must have passed on his X chromosome with the disease allele, making the mother a carrier. Therefore, the most likely genotype for the individual next to the question mark is heterozygous (XaX^A).

Examine the Figure Below of a Pedigree That Diagrams an X-Linked