Ques. Down’s syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?
A. 100 %
B. 75 %
C. 50 %
D. 25 %
Answer:C
Ques. Down’s syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder?
A. 100 % B. 75 % C. 50 % D. 25 %