3 4.4 SRY and Mammalian Sex Determination It is often stated that sex determination in humans is based on the presence or absence of the Y chromosome.
In humans and many other species, sex is determined by specific chromosomes. How did researchers discover these so-called sex chromosomes?
by Katherine J. Wu figures by Daniel Utter. Let’s talk about sex. Seriously. Not intercourse, though – more about how genetic sex is programmed during development.
A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. Most sexual organisms have two sexes.
A look at the two human sex chromosomes (X and Y) and sex linked genes.
The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some
Sex determination results in the development of individuals with characteristics that allow them to be identified as males, females, or in some cases, hermaphrodites.
The XY sex-determination system is the sex-determination system found in humans, most other mammals, some insects , and some plants . In this system, the
The XX/XY sex-determination system is the most familiar, as it is found in humans. In the system, females have two of the same kind of sex chromosome (XX
74 CHAPTER 4:: SEX DETERMINATION AND SEX CHROMOSOMES testosterone and an estrogen called estradiol, control the expres-sion of particular genes.
