Sexual differentiation in humans Sexual differentiation in humans Sexual differentiation in humans is the process of development of sex differences in humans. It is defined as the development of phenotypic structures consequent to the action of hormones produced following gonadal determination. Sexual differentiation includes development of different genitalia and the internal genital tracts, breasts, body hair, and plays a role in gender identification. The development of sexual differences begins with the XY sex-determination system that is present in humans, and complex mechanisms are responsible for the development of the phenotypic differences between male and female humans from an undifferentiated zygote. Females have two X
What She Is (Is a Woman in Love) What She Is (Is a Woman in Love) "What She Is (Is a Woman in Love)" is a song written by Bob McDill and Paul Harrison and recorded by American country music artist Earl Thomas Conley. It was released in February 1988 as the lead single from the album, "The Heart of It All". The song was Earl Thomas Conley's fifteenth number one on the country chart. The single went to number one for one week and spent a total of thirteen weeks on the country chart. "What She Is (Is a Woman in Love)" debuted on the U.S. "Billboard"