A) Down's syndrome
B) Klinefelter's syndrome
C) Turner's syndrome
D) Gynandromorphism
Correct Answer: B
Solution :
[b] Down's syndrome develops due to trisomy of chromosome number 21. In Turner's syndrome, the effect appears due to fusion of a gamete without sex chromosome and a gamete with one X-chromosome (44 + X). Klinefelter individuals are phenotypically males. The defect appears due to fusion of egg having unreduced sex complement (A + X X) with a gamete carrying Y chromosome (44 + XXY). Gynandromorphism occur among Drosophila. In such individuals one half of the body shows male characters and the other half shows female characters.
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