A) \[{{21}^{st}}\]pair having one less
B) \[{{23}^{rd}}\]pair with one less
C) 45
D) 47
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).
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