Question

Study the human karyotype given below and identify the disorder:

• A. Down’s syndrome
• B. Turner’s syndrome
• C. Klinefelter’s syndrome
• D. The karyotype is of a normal individual

Answer 1

The correct option is B Turner’s syndrome

A technique that produces an image of an individual's chromosomes is called karyotype.

A normal diploid cell has 46 chromosomes, out of which 44 are autosomes and 2 are sex chromosomes which are XX and XY for females and males respectively.

The karyotype of a normal person will have a total of 23 pairs of chromosomes.

Females affected with Turner’s syndrome have the chromosomal complement, 44+XO, i.e, they lack an X chromosome. The given karyotype represents the similar condition. Hence, this reflects Turner’s syndrome.

Down’s syndrome is characterized by the presence of three copies of the ${21}^{st}$ chromosome while males with Klinefelter’s syndrome have 44+XXY, i.e. presence of an extra X chromosome.