Which of the following pairs of genetic disorders is caused by the presence of an extra chromosome?
A)Down syndrome and Turner syndrome
B)Turner syndrome and sickle-cell anemia
C)Klinefelter syndrome and Down syndrome
D)Phenylketonuria and XYY syndrome

Question

Quizplus · Accepted Answer

Down syndrome is caused by an extra chromosome 21 (trisomy 21), and Klinefelter syndrome is caused by an extra X chromosome in males (XXY).

Which of the Following Pairs of Genetic Disorders Is Caused