Y chromosome together with the X chromosome, carries the genetic information that determines the sex of an organism. Males have and X and a Y chromosome, females two X chromosomes.
Yerkes–Dodson law A correlation between task performance and optimal level of arousal.
Psychologyintro
Psychology Glossary Y
Psychology Quote
Civilized society is perpetually menaced with disintegration through this primary hostility of men towards one another.
Sigmund Freud