*Correct option: (b) Klinefelter’ syndrome**
Explanation:
Down’ syndrome develops due to trisomy of chromosome number 21. In Turner’ syndrome, the effect appears due to fusion of a gamete without 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 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.
