I. Trisomy \[{{Z}_{1}}\] is the cause of approximately 95% of observed Down syndromes, with 88% coming from nondisj unction in the maternal gamete and 8% coming from nondisjunction in the paternal gamete |
II. It may be due to a Robertsonian translocation where the long arm of chromosome \[{{Z}_{1}}\] is attached to another chromosome, often chromosome 14 |
III. The down syndrome does not run in families |
A) I, II and III
B) I and II
C) I and III
D) II and III
Correct Answer: B
Solution :
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