Question

In Down's syndrome of a male child, the sex complement

• A. $XO$
• B. $XY$
• C. $XX$
• D. $XXY$

Answer 1

The correct option is B $XY$

Down's syndrome does not have any link with sex chromosomes, as Down's syndrome occurs due to the defect in the autosomes. Thus, the sex complement is $XY$.