A) are X-linked recessive genetic disorders.
B) result from inherited chromosomal abnormalities.
C) result from the loss of one entire chromo- some.
D) result from the gain of one entire chromo- some.
Correct Answer: B
Solution :
[b] Cri du chat results from the loss of a critical portion of chromosome number 5, and Down's syndrome from the presence of three copies of chromosome number 21. Both are considered types of chromosomal abnormalities.
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