Biotechnology And Its Applications Question 112
Question: Mongolism syndrome is caused by [AFMC 1985, 86]
Options:
A) One extra chromosome
B) One extra sex chromosome
C) One extra chromosome in 21st pair
D) One less sex chromosome
Show Answer
Answer:
Correct Answer: C
Solution:
Mongolism or Down?s syndrome is caused by nondisjunction of 21st chromosome pair during anaphase I.
As a result (n + 1) gametes are formed.
Fertilization with normal gamete (n) result in trisomy (2n + 1).
BETA
