Sexual reproduction in mammals necessitates two sexes, each of which is characterized by sex-specific anatomical and genetic features. The phenotypic sex of an individual is largely governed by the ...

New research presented today at the European Society for Paediatric Endocrinology meeting has found a genetic region, which may control testicle development in the foetus. Men have XY sex chromosomes, ...

image: One of the significant challenges in sex reversal research is the lack of an in vitro system to model and study variants found in Disorders of Sex Development (DSD) individuals. A study ...

Medical researchers at Melbourne's Murdoch Children's Research Institute have made a new discovery about how a baby's sex is determined—it's not just about the X-Y chromosomes, but involves a ...

Human sperm cells travel up to 6 meters in their transit from testes to penis, and most of that journey occurs in the epididymis, a tightly coiled tube that primes the cells for their ultimate task: ...

It's generally understood that the biological sex of an embryo is determined by the chromosomes at conception – two X chromosomes will develop as female, while an XY combo will become male. But this ...

A gene essential to the growth and development of most organ systems in the body also is vital to female, but not male, embryonic sexual development, scientists report. A gene essential to the growth ...