A person with Klinefelter syndrome has 44 chromosomes and three sex chromosomes (XXY). The resulting aneuploidy is caused by
A) nondisjunction.
B) crossing over.
C) a mutation.
D) an enzyme deficiency.
E) failure of DNA to replicate.

Question

Quizplus · Accepted Answer

Klinefelter syndrome is caused by nondisjunction during meiosis, resulting in the individual having an extra X chromosome. This results in 44 chromosomes and XXY sex chromosomes.

A Person with Klinefelter Syndrome Has 44 Chromosomes and Three