Q176 / 200 · NEET 2005 · Zoology

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

  • A
    superfemaleness
  • B
    triploidy
  • C
    turner syndrome
  • Correct answer
    D
    down syndrome.

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 $(22+\mathrm{XO})$. 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.

Hence, the correct answer is option: 'D'.

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