General Science - Biology
General Knowledge

 Back to Questions
Q.

Down syndrome is caused by having three copies of the genes on:

 A.

Chromosome 8

 B.

Chromosome 12

 C.

Chromosome 21

 D.

Chromosome 22

 Hide Ans

Solution:
Option(C) is correct

Down syndrome is caused by having three copies of the genes on chromosome 21, rather than the usual two.

The parents of the affected individual are typically genetically normal.

Those who have one child with Down syndrome have about a 1% risk of having a second child with the syndrome, if both parents are found to have normal karyotypes


(0) Comment(s)