A phenotypically normal man marries a phenotypically normal woman whose father was color blind. They have a color-blind daughter with Turner syndrome (XO). What is the BEST explanation for this result?

Question

Quizplus · Accepted Answer

The color-blind daughter with Turner syndrome indicates that she inherited the X chromosome carrying the color-blind allele from her father, who must have undergone nondisjunction, resulting in a sperm with no sex chromosome (O) and a sperm with an X chromosome carrying the color-blind allele. The daughter received the X chromosome from her father and no sex chromosome from her mother, leading to Turner syndrome (XO).

A Phenotypically Normal Man Marries a Phenotypically Normal Woman Whose