catherinesieck:‘Putting the X and Y in SEXY’ How chromosomal genes turn us int
catherinesieck: ‘Putting the X and Y in SEXY’ How chromosomal genes turn us into boys, girls, and sometimes a bit of both An Illustrated Presentation By Scott Gilbert, Swarthmore College at The Wagner Free Institute of Science of Philadelphia Wednesday April 16th “The idea that mammals with two X chromosomes become females while mammals with an X and Y chromosome become males was discovered in 1905, but scientists are still uncovering how the genes on these chromosomes cause the development of testes and ovaries and how these organs organize tissues to become either male or female. Males and females take the same parts and modify them in different ways—we’re only now figuring out how this is done. Sometimes, there is a disconnect between what the genes say we are and how we actually turn out. Maybe it is time to redefine our two-sex world.” you either have a y or you don’t. you only need one x to be female. there are two sexes. case closed. -- source link