Why does the father determine the gender of an individual?

Answer 1

This has to do with basic genetics. Women always pass on an X chromosome to a baby, and men can pass on either an X or a Y. A girl has two X chromosomes one from mom one from dad. A boy has one X and one Y. X from mom Y from dad, so the father decides gender based on what he passes on to the child.

The female carries two chromosomes both of them X

The male carries two also but they are X and Y

When the sperm impregnates the egg, if it is a Y it is a boy

if the sperm impregantes it with an X, then it is a girl.

The reason is that the SRY gene is responsible for the production of androgenes (male sex hormones) and this gene is linked to the Y-chromosome. (In some rare cases a child may; however, lack sensitivity of the androgenes and turn out an XY female as in the CAIS syndrome)

Since as many as 500.000 sperm cells are released during ejaculation it might seem random which one reaches the egg first. Some people claim, however, that the woman may influence this! The reason is that the Y chromosome is physically smaller than the X chromosome and therefore sperm cells containing a Y will have a tendency to move faster through the vagina and uterus. On the other hand sperm cells containing an X chromosome tends to survive a longer period of time. Together this means that sex close to the time of ovulation (which is usually 14 days before the next cyclus begins) is more likely to result in a male baby.

Though the male's sperm is responsible for determining the sex of a child at "conception" meaning the fertilization of the egg, the woman's vaginal conditions can determine which of the sperm (Y's or X's) are left for fertilization. The Y's are more fragile, so if the woman's body is more acidic and higher in temperature the more likely the X sperms will only survive.

Answer 2

The sperm from the father can supply either an X-bearing or a Y-bearing chromosome. The egg from the mother can only supply an X-bearing chromosome. An XY combination produces a boy baby. An XX combination produces a girl baby. It might seem that the father therefore determines the sex of the baby, but some recent evidence suggests that the mother can select either an X-bearing or a Y-bearing sperm. See the Wikipedia article on "Maternal influence on sex determination."

Answer 3

In reproduction, the woman donates an egg and the man donates a sperm. Each has only one sex chromosome, X or Y. The egg is always X. The sperm cell can contain an X or a Y chromosome. A person who is XX is female and a person who is XY is male.

Answer 4

Only he has the chromosome of both male and female hence determining weather the fetus will develop into a male or female.

Answer 5

Women carry XX and men carry XY. Every human is XX or XY. The baby gets an X from the mom and either the X or the Y from the dad.