Sandy was born with a flat face, a small nose, protruding lips and tongue, and slanting eyes.These features were a result of chromosome 21 being present in triplicate.Sandy was most likely born with
A)Klinefelter syndrome.
B)Down syndrome.
C)Tay-Sachs disease.
D)Fragile X syndrome.

Question

Quizplus · Accepted Answer

The physical features described in the question are characteristic of Down syndrome, which is caused by the presence of an extra copy of chromosome 21 (known as trisomy 21). Klinefelter syndrome involves an extra X chromosome in males, and is not associated with the physical features described. Tay-Sachs disease and Fragile X syndrome are both caused by mutations in specific genes, and do not involve changes in chromosome number.

Sandy Was Born with a Flat Face, a Small Nose