A mouse study may pave the way for new approaches to contraception and infertility treatment. Sperm are surprisingly picky ...

A study published today (May 21) in BMC Genomics now suggests that female mammals may be able to sense and respond differently to X and Y chromosome sperm. Alireza Fazeli, a reproductive biologist at ...

While hormone cycles are typically associated with female mammals, males also experience hormone fluctuations, many of which act on similar receptors. For example, testosterone can be converted to ...

Bonobos, which are among our closest living relatives, live in rare societies where females tend to outrank males, even though males are larger and stronger. Scientists compiled decades of observation ...

Inactivation also explained why XO female mice were able to survive with ... concluding that X inactivation applies generally to mammals.