We know that there are 23 pairs of chromosomes are present. The first 22 pairs are similar and are called AUTOSOMES. The last pair of chromosome is not same in both male and female. read more
A female has the sex chromosomes XX. She received one X chromosome from her father and the other X chromosome from her mother. The key X chromosome that is present both in females and males is the one that came from his mother or her mother. What many people do not appreciate is that this chromosome is responsible for longevity. read more
Sex chromosome, either of a pair of chromosomes that determine whether an individual is male or female. The sex chromosomes of human beings and other mammals are designated by scientists as X and Y. In humans the sex chromosomes comprise one pair of the total of 23 pairs of chromosomes. read more
In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively. Hormone levels in the male parent affect the sex ratio of sperm in humans. read more