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Q.

Klinefelter’s syndrome occur in which of the following conditions?

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a

 An abnormal ovum with two allosomes and a normal sperm with Y allosome.

b

 An abnormal ovum with no allosome and an abnormal sperm with X and Y allosomes.

c

A normal ovum with one allosome and an abnormal sperm with no allosome.

d

An abnormal ovum with two allosomes and a normal sperm with X allosome

answer is A.

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Detailed Solution

When an abnormal ovum (with two allosomes (XX)) fuses with a normal sperm (with Y allosome), the resulting zygote would have XXY chromosomes. It is the karyotype of a person with Klinefelter's syndrome.

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