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XY complete gonadal dysgenesis, also known as Swyer syndrome, is a type of defect hypogonadism in a person whose karyotype is 46,XY. Though they typically have normal vulvas , [ 1 ] the person has underdeveloped gonads, fibrous tissue termed " streak gonads ", and if left untreated, will not experience puberty .
[2] [3] In most species with XY sex determination, an organism must have at least one X chromosome in order to survive. [4] [5] The XY system contrasts in several ways with the ZW sex-determination system found in birds, some insects, many reptiles, and various other animals, in which the heterogametic sex is female.
The development of sexual differences begins with the XY sex-determination system that is present in humans, and complex mechanisms are responsible for the development of the phenotypic differences between male and female humans from an undifferentiated zygote. [3] Females typically have two X chromosomes, and males typically have a Y ...
A U.K. woman who was told she would never have children because of a rare condition recently gave birth to twins. When Hayley Haynes was 19, she went to the doctor because she hadn't gotten her ...
The XX/XY sex-determination system is the most familiar, as it is found in humans. The XX/XY system is found in most other mammals, as well as some insects. In this system, females have two of the same kind of sex chromosome (XX), while males have two distinct sex chromosomes (XY).
A woman give birth to quadruplets in October after receiving the shocking news in April (Getty Images) According to the Journal of Family and Reproductive Health, the odds of naturally conceiving ...
Some females have three Xs , and some have a single X instead of two Xs ("X0", see Turner syndrome). There are other variations in which, during embryonic development, the WNT4 gene [7] is activated and/or the SRY gene is damaged leading to birth of an XY female (Swyer syndrome [7]).
In the domesticated papaya (Carica papaya), three sex chromosomes are present, denoted as X, Y and Y h. This corresponds with three sexes: females with XX chromosomes, males with XY, and hermaphrodites with XY h. The hermaphrodite sex is estimated to have arisen only 4000 years ago, post-domestication of the plant.