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Question

The sex determination symbol is XXY in human beings with a syndrome known as:


A

Turner's

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B

Male Klinefelter

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C

Female Klinefelter

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D

Down's

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Solution

The correct option is B

Male Klinefelter


The correct option is B.

Explanation of the correct option:

  1. Normally, males have XY sex chromosomes, and females have XX sex chromosomes.
  2. Klinefelter's syndrome is a genetic condition where males have an extra copy of the X chromosome(XXY).

Explanation of the incorrect options:

Option A:

Turner's syndrome is a chromosomal disorder where the female is born with the absence of an X chromosome (XO).

Option C:

Klinefelter's does not affect women.

Option D:

  1. Down's syndrome is a chromosomal condition where the 21st chromosome has an extra copy.
  2. It is called trisomy 21, individuals with Down syndrome have 47 chromosomes.

Final answer: The sex determination symbol is XXY in human beings with a syndrome known Male Klinefelter.


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