AP BIOLOGY

Detailed explanation-1: -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. Therefore it is said that father determines the sex of the child.

Detailed explanation-2: -It’s all about Dad’s genes A man’s X and a woman’s X combine to become a girl, and a man’s Y combines with a woman’s X to become a boy. But if the sperm don’t have equal Xs and Ys, or if other genetic factors are at play, it can affect the sex ratio.

Detailed explanation-3: -Determination of sex in human being is determined by the sex chromosomes (XX in females & XY in male). If a sperm carrying X’ fuses with ovum, female offspring is produced. If sperm with Y fuses with ovum, male offspring is produced. Hence sex chromosomes of male parent are involved in determining the sex of offspring.

Detailed explanation-4: -All children inherit ‘X’ chromosomes from their mother. If the offspring inherit ‘X’ chromosome from the father then it will be a daughter and if the offspring inherit ‘Y’ chromosome from the father then it will be a Son. thus in human beings, sex of a child is determined by the father only.