Swyer syndrome is a condition that affects sexual development. Sexual development is usually determined by an individual's chromosomes; however, in Swyer syndrome , sexual development does not match the affected individual's chromosomal makeup. People usually have 46 chromosomes in each cell. Two of the 46 chromosomes, known as X and Y, are called sex chromosomes because they help determine whether a person will develop male or female sex characteristics. Girls and women typically have two X chromosomes 46,XX karyotype , while boys and men usually have one X chromosome and one Y chromosome 46,XY karyotype.
Sex and Relationships: the seven sexual ages of men
You could also say that the human male has seven sexual ages, marked by a gradual decline in activity. Under males are usually chock full of testosterone. Research from Alfred Kinsey onwards has shown that, on average, they have about three orgasms per week — but in some cases many more. The twentysomething male has only slightly less testosterone than his teenage self.
Humans are born with 46 chromosomes in 23 pairs. Most women are 46XX and most men are 46XY. Research suggests, however, that in a few births per thousand some individuals will be born with a single sex chromosome 45X or 45Y sex monosomies and some with three or more sex chromosomes 47XXX, 47XYY or 47XXY, etc. In addition, some males are born 46XX due to the translocation of a tiny section of the sex determining region of the Y chromosome.
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