Multiple choice

Down’s syndrome is caused by an extra copy of chromosome number 21. What percentage of offsprings produced by an affected mother and a normal father would be affected by this disorder?

  1. 15%

  2. 25%

  3. 75%

  4. 100%

  5. 50%
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

50% of the eggs having 24 chromosomes will produce Down’s syndrome.

Keep practicing — related questions