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NEET 2005
Exam
NEET
Year
2005
Subject
Zoology
Chapter
Principles of Inheritance and Variation

NEET 2005 · Zoology · Principles of Inheritance and Variation

A women with 47 chromosomes due to three copies of chromosome 21 is...

A women with 47 chromosomes due to three copies of chromosome 21 is characterized by:

Options

  1. Asuperfemaleness
  2. Btriploidy
  3. Cturner syndrome
  4. Ddown syndrome.

Correct answer

D. down syndrome.

Step-by-step solution

Down Syndrome is a chromosomal aneuploidy, caused by an extra copy of chromosome 21 known as trisomy 21. Turner syndrome is caused by partial or complete loss (monosomy) of the second sex chromosome (22+XO)(22+\mathrm{XO}). Triploidy is the presence of an additional set of chromosomes in the cell for a total of 69 chromosomes rather than the normal 46 chromosomes per cell.
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