Which one of the following conditions in humans. is correctly

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Which one of the following conditions in humans. is correctly matched with its chromosomal abnormality/linkage?

1. Klinefelters syndrome-44 autosomes + XXY
2. Colour blindness - Y-linked
3. Erythroblastosis foetalis - X-linked
4. Downs syndrome - 44 autosomes + XO

Correct Option: A

Klinefelter's syndrome is a genetic disorder affecting men in which an individual gains an extra X chromosome, so that the usual Karyotype of XY is replaced by one of XXY. Symptoms of Klinefelter's syndrome named after us physician H.P. Klinefelter, include female characteristics (such as breast enlargement). So, the corresponding genotype will be AaBb.