On average, human males tend to be about 5 inches ( 13 centimeters) taller than females. But why?

Sex chromosomes are the genetic elements that define a person's biological sex. Learn about the XX and XY chromosomes, the sex determination system, and other chromosome combinations.

The notion that sex could be determined by chromosomes was a new idea. Prior to Henking, McClung, and Sutton's reports, sex determination was attributed to factors other than gametes, such as the ...

The sex chromosomes -- XX in women and XY in men -- date from the earliest mammals, but how did they evolve to look as they do today? While the male-determining Y has received lots of attention, a ...

Males, on the other hand, carry only one X chromosome (XO) and produce some gametes with X chromosomes and some gametes with no sex chromosomes at all (Figure 5). Figure 6: Sex determination in birds.

The octopus just revealed another one of its secrets: what determines its sex. University of Oregon researchers have ...

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The oldest-known sex chromosome emerged in octopus and squid between 455 million and 248 million years ago — 180 million years earlier than the previous record-holder, scientists have discovered.

The exception was the hypothesized sex chromosome, which was present in two copies in some individuals and in a single copy in others—exactly as one would expect from a ZZ/Z0 system of sex ...

Scientists solve the genetic puzzle of sex-related Y chromosome. By Will Dunham. August 23, 2023 10:08 PM UTC Updated August 23, 2023 Item 1 of 2 An athlete competes in the men's ...

Sex-specific chromosomes are a dangerous place to be, if you're a gene. Because these chromosomes -- Y chromosomes, in humans -- do not have a matching chromosome with which to exchange genetic ...

The Y chromosome is passed down exclusively from father to son. University of Arizona The human sex chromosomes, X and Y, evolved over the past 300 million years from the other, non-sex chromosomes.