Question

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

• A. 44+XX
• B. 44+XY
• C. 23+XY
• D. 22+XX

Answer 1

The correct option is A 44+XX

$\bullet$ Humans have 23 pairs of chromosomes in each cell. Among them, 22 pairs are autosomes and the remaining 1 pair has sex chromosomes.
$\bullet$ Both the sex chromosomes in females are X . Whereas, sex chromosomes in males are X and Y.
$\bullet$ Gametes (ovum and sperm) are the reproductive cells that fuses during sexual reproduction to form a zygote. The zygotic cell contains 46 chromosomes with 23 chromosomes from each parent. Thus sperm has either 22+X or 22+Y and ovum has 22+X.
$\bullet$ Hence, the zygotic cell with chromosomal composition of 44+XX would lead to the birth of female child and the one with 44+XY would lead to the birth of male child.