Biotechnology And Its Applications Question 16
Question: In Down’s syndrome (Mongolism) each cell has how many chromosomes [MP PMT 1998]
Options:
A) $ 21^{st} $ pair having one less
B) $ 23^{rd} $ pair with one less
C) 45
D) 47
Show Answer
Answer:
Correct Answer: D
Solution:
Down?s syndrome is caused by the presence of an extra chromosome number 21.
Thus the egg possesses 24 chromosomes instead of 23 and offspring has 47 chromosomes (45 + xy in male, 45 + xx in female).
BETA
