Is the Y chromosome the only factor that determines sex?

Yes. Because the Y chromosome records the sex genes of humans and there are no other factors, the Y chromosome is the only factor that determines sex.

Yes. Because those of us who have studied biology know that the Y chromosome is transmitted to males but not females, xx is a girl, and XY is a boy.

Y mainly contains the SRY gene that determines the male sex, 95% of which is a male-specific region, which contains genes related to males, and its role is to make part of the embryonic tissue directional differentiation into the male internal and external reproductive system, so that the male can become a male.

Males have germ cells that contain both chromosomes x and y.

Females only have germ cells on the X chromosome.

Men can only come out of one at random, and women can only get out of x.

The combination of X and Y is the XY embryo, which is male.

The combination of X and X is the XX embryo, which is female.

Human somatic chromosomes are divided into autosomes and sex chromosomes Autosomes are not related to sex determination, all chromosomes except sex chromosomes For example, humans have 22 pairs of autosomes, and 1 pair of sex chromosomes touch the hocks body Human normal chromosomes are 46 (23 pairs), of which 22 pairs are called autosomes, and both men and women laugh and laugh the same; The 23rd pair is called the sex chromosome, and the sex of the person is mainly determined by the sex chromosomes, the chromosome composition in the male somatic cells is 22 pairs of autosomes + xy, and the chromosome composition in the female somatic cells is 22 pairs of autosomes + xx

So the answer is:

The chromosomes provided by males are divided into X and Y, and the X chromosome of males, combined with the X chromosome of females, will give birth to girls; The male Y chromosome, combined with the female X chromosome, gives birth to a male child.

The chromosomes of the human body are very important, chromosomes can be inherited, and the X chromosome or Y chromosome can determine the sex of the fetus.

It is the genetic material in the nucleus of the cell, which is easily dyed dark by basic dyes, so it will have the name of the chromosome.

There are dominant genes on the Y chromosome. In the homology region, there are genes that are both dominant and negative, and there may be both dominant and negative on the Y chromosome. In the non-homologous region, it should be expressed regardless of the yin and the negative.

There are dominant recessive genes on the X and Y chromosomes, but the Y chromosome genes are not inherited and sent to girls, if the father is a dominant disease on the Y chromosome, it is best to have a girl.

The child is evolved from chromosomes, chromosomes determine the gender of the child, and there is genetic material, some of the parents' special signs will be passed on to the child through the chromosome, the chromosome plays a very important role in giving birth to a child, some friends have chromosome deletions, if there is no sperm or oligospermia, you need to check the Y chromosome when doing the examination.

In addition to the same xy-type sex determination as humans, there is also a sex determination method called zw-type sex determination, that is, females have 2 heterotypic sex chromosomes, and males have 2 identical sex chromosomes, which is called zw type In this type of organism, males are homogamous Females' sex chromosomes are composed of zw, and males are composed of sex chromosomes of ZZ Birds, lepidopteran insects, some amphibians, and reptiles are of this type For example, domestic chickens, silkworms, etc.; In addition, there are other ways to determine the sex of organisms: zo sex determination, XO sex determination, etc

So the answer is: