Question

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

• A. Klinefelter's syndrome: 44 autosomes + XXY
• B. Colour blindness: Y-linked
• C. Erythroblastosis: X-linked
• D. Down's syndrome: 44 autosomes + XO

Answer 1

The correct option is A Klinefelter's syndrome: 44 autosomes + XXY

Klinefelter's syndrome is represented by 44 autosomes + XXY. If affects only males and usually become apparent at puberty.

Colour blindness: X linked recessive disease
Erythroblastosis: Rh incompatibility
Down's syndrome: Trisomy of chromosome 21 (45 autosomes + XX/XY)