which concept refers to humans who have some combination of female and male sexual characteristics?
Biological sex identifies a person as either female, male, or intersex. It is determined by a person’s sexual anatomy, chromosomes, and hormones. Biological sex is often simply referred to as “sex.”. Our biological sex is established when an egg is fertilized. Most often, men ejaculate two types of sperm.
Physical differences between males and females in species are common, but there remains much to learn about the genetic mechanisms behind these differences. New research by scientists at Indiana University finds that the master gene that regulates these differences plays a complex role in matching the right physical trait to the right sex. The study, published Feb. 27 in the journal Nature Communications, reveals new details about the behavior of the gene called doublesex, or dsx.