Tom is a tall man with undeveloped testes and enlarged breasts.His doctor has determined that he has an extra X chromosome leading to the diagnosis of:
A) Down syndrome.
B) fragile X syndrome.
C) Klinefelter syndrome.
D) Turner syndrome.

Question

Quizplus · Accepted Answer

Klinefelter syndrome is caused by the presence of an extra X chromosome in males (XXY). Symptoms can include tall stature, underdeveloped testes, and breast enlargement (gynecomastia). Down syndrome is caused by an extra copy of chromosome 21; fragile X syndrome is caused by a mutation in the FMR1 gene; Turner syndrome is caused by a missing or partially missing X chromosome in females.

Tom Is a Tall Man with Undeveloped Testes and Enlarged