A) trisomy 21
B) phenylalanine hydroxylase
C) myelinisation of neuron
D) Y-chromosome
Correct Answer: D
Solution :
Y-chromosome. Mental retardation is not related with Y-chromosome. In human, function Y-chromosome is less and it controls the maleness, i.e., body hairs, testes, etc.You need to login to perform this action.
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