Question

In Down' syndrome of a male child, the ** complement is

(a) XO

(b) XY

(c) XX

(d) XXY

Answer 1

Correct option (b) XY

Explanation

XY is the complement of a male child with Down' syndrome. The cause of Down' syndrome is non-disjunction of 21st chromosome during oogenesis. This chromosomal abnormality is related with autosome so, the complement of a male child in this syndrome will be XY.