A) Down syndrome
B) triploidy
C) Turner syndrome
D) super femaleness
Correct Answer: A
Solution :
Down's syndrome is due to an extra chromosome which combines to the chromosome pair 21. Down syndrome is caused due to trisomy, in which the fusion of a normal n gamete (haploid) takes place with an n + 1 gamete (diploid). J. Langdon Down first described the developmental defect produced by trisomy in 1866. For this reason it is called Down's syndrome. Persons having Down's syndrome generally have a short, stocky build, short hands, flattened facial features and poor muscle tone. In addition they are mentally retarded.
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