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 Is Beat? What Is Beat? What Is Beat? – The Best of The Beat is a greatest hits album by the ska band The Beat released in 1983. The original vinyl release included an additional "free album" of extended remixes entitled Frebe. Several songs had previously only been released as singles and B-sides. These include "Too Nice to Talk To", "March of the Swivelheads" and "Psychedelic Rockers". In the UK these also include the A-side "Tears of a Clown" and "Ranking Full Stop". "March of the Swivelheads" later appeared in the film "Ferris Bueller's Day Off". The song accompanies the film's climax.