Biotechnology And Its Applications Question 124
Question: The number of chromosomes in Down’s syndrome is [CPMT 1983; CBSE PMT 2005; AFMC 2005; MP PMT 2005]
Options:
A) 23rd pair with one less = 45
B) 21st pair with one more = 47
C) 17th pair with one more = 47
D) One extra sex chromosome = 47
Show Answer
Answer:
Correct Answer: B
Solution:
The individuals with this syndrome are trisomic for chromosome 21.
Chromosomal complement is 46 + additional chromosome 21 = 47.
BETA
