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These disturb the development of the gonads more than they influence the external genitalia; therefore, many of the conditions are not diagnosed until after puberty, when the child or parents becomes concerned about the lack of development of sexual characteristics. After the discovery of the testis-determining gene SRY , many scientists shifted to the theory that the genetic mechanism that causes a fetus to develop into a male form was initiated by the SRY gene, which was thought to be responsible for the production of testosterone and its overall effects on body and brain development. For example, more boys are born each year than girls. In Y-centered sex determination, the SRY gene is the main gene in determining male characteristics, but multiple genes are required to develop testes. Both types of sperm would have an equal chance of reaching the egg first.
Genetic Components of Sex and Gender. Humans are born with 46 chromosomes in 23 pairs. The X and Y chromosomes determine a person’s sex. Most women are 46XX and most men are 46XY. In humans and many other species of animals, the father determines the sex of the child. 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. 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 .
A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. Most organisms that create their offspring using sexual reproduction have two sexes. Occasionally, there are hermaphrodites in place of one or both sexes. There are also some species that what determines sex genetic determine only one sex due to parthenogenesisthe act of a female reproducing without fertilization. In many species, sex determination is genetic:
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