Question

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

• A. Turner's
• B. Male Klinefelter
• C. Female Klinefelter
• D. Down's

Answer 1

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.