“This is an space that isn’t absolutely recognized, but numerous genes associated in the growth of penis and limbs appear from the X chromosome,” Darius Paduch, director of sexual well being and drugs at Weil Cornell, reported in an interview with Mel Journal. “Guys have one particular X chromosome, and women of all ages have two. Given that boys always inherit the X chromosome from the mom and the variety of that X chromosome is random, this can clarify why a person brother may possibly have inherited genes for a significant penis from one particular of the mother’s X chromosomes, but a different brother inherited an average-dimensions penis from the other.”

Resource hyperlink