Principles of Inheritance and Variation Question 186
186. Mongoloid idiocy in humans is also known as
(a) Tay Sachs disease
(b) Klinefelter’s syndrome
(c) Down’s Syndrome
(d) Turner’s Syndrome
Show Answer
Answer : c
Hints & Solution
(c) Down’s syndrome develops due to trisomy of the $21^{\text{st }}$ chromosome. Affected individual possess a characteristic appearance. They have short stature, small round head, broad forehead, open mouth and projecting lower lip (Mongoloid idiocy).
