Question

1. the pedigree to the right shows a familys pedigree for colorblindness. which sex can be carriers of colorblindness and not have it? ____________

Explanation:

Colorblindness is an X - linked recessive disorder. Females have two X chromosomes (\(X^X\)). A female can be a carrier (\(X^cX\), where \(X^c\) is the color - blind allele and \(X\) is the normal allele) because the normal allele can mask the effect of the recessive color - blind allele. Males have one X and one Y chromosome (\(XY\)). If a male has the color - blind allele on his X chromosome (\(X^cY\)), he will express the colorblindness trait since there is no second X chromosome with a normal allele to mask it.

Answer:

Females.