Principle of Inheritance and VariationHard

Question

Mental retardation in man, associated with sex chromosomal abnormality is usually due to

Options

A.reduction in X-complement
B.increase in X-complement
C.moderate increase in Y-complement
D.large increase in Y-complement

Solution

Klinefelter′s syndrome is formed by union of an XX egg and a normal Y sperm or normal X egg and abnormal XY sperm. The individual thus has 47 chromosomes (44 + XXY). Such per sons are sterile males with undeveloped testes, mental retardtion etc.

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