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
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
- [AIPMT 2003]
- A
$25\%$
- B
$100\%$
- C
$75\%$
- D
$50\%$
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