Trisomy 21 is another name for

Question

Quizplus · Accepted Answer

Trisomy 21 refers to the presence of three copies of chromosome 21, which results in Down syndrome. Choice B is incorrect as Turner syndrome involves the absence or partial absence of one of the X chromosomes. Choice C is also incorrect as Kanner's syndrome is an old term for autism, which is not related to chromosomal abnormalities. Choice D is incorrect as fragile X syndrome is caused by a mutation in the FMR1 gene on the X chromosome, rather than an extra chromosome 21.

Trisomy 21 Is Another Name for