The condition that results from deletion of material in the seventh pair of chromosomes and often results in intellectual disabilities,heart defects,and elfin facial features is
A)Down syndrome.
B)Williams syndrome.
C)Fragile X syndrome.
D)Prader-Wili syndrome.

Question

Quizplus · Accepted Answer

Williams syndrome is caused by the deletion of material in the seventh pair of chromosomes and is characterized by intellectual disabilities, heart defects, and elfin facial features. Down syndrome is caused by an extra copy of chromosome 21, Fragile X syndrome is caused by a mutation in the FMR1 gene, and Prader-Wili syndrome is caused by a deletion or loss of function in several genes on chromosome 15.

The Condition That Results from Deletion of Material in the Seventh