Answer
B
Work Step by Step
Nondisjunction of the X chromosomes in the mother leads to one egg receiving no X chromosome. Therefore, when an egg cell with no X chromosome joins with a sperm cell with a normal X chromosome, the resulting embryo is a female with a single X chromosome.
Options A, C, and D are conditions resulting from defective copies of genes and are not a defect in the number of chromosomes resulting from nondisjunction.
