A) J.L Down (1866)
B) Lejeune (1959)
C) Klinefeltcr (1942)
D) Huntington (1872)
Correct Answer: B
Solution :
Downs syndrome due to extra 21st chromosome was reported by French Physian Lejeune (1959) using microscopic techniques. The presence of 3 copies of a chromosome is called trisomy. Downs syndrome is a trisomy of autosome.
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