A) autosomal abnormality
B) sex chromosomal abnormality
C) sex-linked disease
D) None of the above
Correct Answer: A
Solution :
Down's syndrome is autosomal abnormality. It arises due to trisomy of 21st chromosome, ie, total 47 chromosomes will be present in the person. It is also called Mongolian idiocy. The syndrome was reported first time by an English physician John Langdon Down in 1866. The main features are mental deficiency, sound face, small ears, protruding tongue etc.
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