Question

A person with chromosomes complement of XXX is
A. Klinefelter’s syndrome
B. Down’s syndrome
C. Turner’s syndrome
D. Super female

Answer 1

Hint: The presence of triple X is called trisomy of X or triple X syndrome. It is characterized by the presence of 47 chromosomes. Normal females have 46 chromosomes but X trisomy causes an extra X chromosome to be paired with the sex chromosome pair.

Complete answer:
The normal chromosome set in a human is 23 pairs that are 46 chromosomes in total. The 23rd or the last pair of chromosomes is called sex chromosomes. The sex chromosome in females is represented by XX. There are several disorders related to X chromosomes. A person who carries an extra X chromosome shows a trisomy of X and is known to have triple X syndrome. Such females are called super females.
Although some studies suggest infertility or irregular menstruation, commonly no certain differences are seen in affected females. Some of the affected females may be sterile. Other symptoms include learning difficulties, seizures, kidney problems, and decreased muscle tone. The abnormal segregation during female gametogenesis results in the occurrence of extra X. This is a result of a random event during gamete formation. It is usually not inherited. Some of the cases occur where half the body cells contain XXX but others are normal. Chromosomal analysis is a diagnostic tool. The situation was first detected in 1959.

So, the correct answer is option D.

Note: The treatment of XXX syndrome may include speech therapy, counseling, and physical therapy. Every 1 in 1,000 females is affected by this syndrome. A stable home environment should be provided to the affected females. The first case appeared in Scotland.