A) Downs syndrome-21st chromosome
B) Sickle cell anaemia-X-chromosome
C) Haemophilia-y-chromomosome
D) Parkinson disease-X and Y chromosome
Correct Answer: A
Solution :
Downs syndrome also known: is Mangolian idiocy is a trisomic condition resulting from non-disjunction of chromosome number 21st. The child is mentally retarded, has flat face and eyes like those found in mangolian race (and hence the name).
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