Question

Which one of the following conditions of the zygotic cell would lead to the birth of a female child?

• A. Two X chromosomes
• B. Only one Y chromosome
• C. Only one X chromosome
• D. (a) and (c) above.

Answer 1

The correct option is D (a) and (c) above.

• In humans, the normal female karyotype has a pair of X chromosomes. Hence, the chromosomal composition of normal female is 44 + XX.
• Absence of one of the X chromosomes or inactivation of the other X chromosome in females leads to Turner's syndrome. Hence, the chromosomal composition of the affected female is 44 + X