Question

Explain sex determination in humans with the help of flow-chart.

Answer 1

In the human being, the chromosomal mechanism of sex determination is of XX-XY type. In human the nucleus of each cell contains 46 chromosomes or 23 pairs of chromosomes of body characters) and 1 pair is of sex chromosomes (responsible for determination of sex).

1. In the female, two homomorphic sex chromosomes are XX.

2. In the male, two heteromorphic sex chromosomes are XY.

3. The genotypes of female and male is

Female : 46 Chromosomes = 44 Autosomes + XX sex chromosomes

Male : 46 Chromosomes = 44 Autosomes + XY sex chromosomes