The process by which your baby becomes a boy or a girl, according to what's written in his or her genetic code, is awe-inspiring. This allows them to create more workers, depending on the status of the colony. This depends on the presence or absence of the sex determining region of the Y chromosome, also known as the SRY gene. In XY mice, lack of the gene DAX1 on the X chromosome results in sterility, but in humans it causes adrenal hypoplasia congenita. A 5-alpha-reductase deficiency results in atypical development characterized by female phenotype or undervirilized male phenotype with development of the epididymis , vas deferens , seminal vesicle , and ejaculatory duct , but also a pseudovagina. Male development can only occur when the fetal testis secretes key hormones at a critical period in early gestation. For example, some studies claim girls are, on average, more verbally fluent than boys, but boys are, on average, better at spatial calculation. This process is called sexual differentiation. Disruption of typical development may result in the development of both, or neither, duct system, which may produce morphologically intersex individuals.
This includes both internal and external genital differentiation. Male development can only occur when the fetal testis secretes key hormones at a critical period in early gestation. X0 sex-determination system In this variant of the XY system, females have two copies of the sex chromosome XX but males have only one X0. Prior to this, the child is considered bipotential because it cannot be identified as male or female. This is because of the presence of the sex determining region of the Y chromosome, also known as the SRY gene. Male levels of testosterone directly induce growth of the penis, and indirectly via DHT the prostate. Disruption of typical development may result in the development of both, or neither, duct system, which may produce morphologically intersex individuals. Diploid individuals are generally female but may be sterile males. In Y-centered sex determination, the SRY gene is the main gene in determining male characteristics, but multiple genes are required to develop testes. A small number of mammals also lack a Y chromosome. It is the Y chromosome that is essential for the development of the male reproductive organs, and with no Y chromosome, an embryo will develop into a female. This test isn't without risk, however, and isn't performed simply to determine the sex of your baby. The internal genitalia are all the accessory glands and ducts that connect the gonads to the outside environment. Testosterone will also control the descending of the testes from the abdomen into the scrotum. The process by which your baby becomes a boy or a girl, according to what's written in his or her genetic code, is awe-inspiring. In some species, such as humans, organisms remain sex indifferent for a time after they're created; in others, however, such as fruit flies, sexual differentiation occurs as soon as the egg is fertilized. I'm often asked if you can tell the baby's sex by the heart rate—based on the myth that one sex is faster than another—but that's just an old wives' tale. Still others use a "pendulum test" in which an object is suspended over the pregnant belly and the baby's sex is revealed depending on which way the pendulum swings. Internal genital differentiation[ edit ] The internal genitalia consist of two accessory ducts: Again, there is no documented proof that this test works. In this system, most females have two of the same kind of sex chromosome XX , while most males have two distinct sex chromosomes XY. Dihydrotestosterone will differentiate the remaining male characteristics of the external genitalia. Unfertilized eggs develop into haploid individuals, which are the males. This is due to the fact that the haploid eggs double their chromosomes, resulting in ZZ or WW. In the chicken, this was found to be dependent on the expression of DMRT1. Doctors can usually determine the baby's sex during a routine ultrasound visit at this time, but not always.
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