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

A) Down syndrome - 44 autosomes + XO
B) Klinefelter syndrome - 44 autosomes + XXY
C) Colour blindness - Y-linked
D) Erythroblastosis foetalis - X-linked
Explanation

[Solution from source] Klinefelter syndrome results from an extra X chromosome in a male, giving 44 autosomes + XXY (47 chromosomes). Down syndrome is trisomy 21 (44 + XO is Turner syndrome), colour blindness is X-linked, and erythroblastosis foetalis comes from Rh incompatibility, not sex linkage. Answer (2).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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