y. chromosome pair it will become male. but it's more complex than the gender is determined by an interplay of genes and hormones as well as other factors . in the sixth or seventh week the embryo is about one centimeter long. typically male development begins when the primitive gonads become testes. the testes release testosterone an important step in the development of a typically biological male. this hormone together with other factors is involved in the formation of the virus deference the seminal vesicles and the prostate gland . at the same time the gentle structures develop into the glands the penis and the fore skin. typically biologically female development begins when the primitive gonads become ovaries. they produce the hormone estar dial. as with testosterone and boys as to dial plays an important role in the development of a biological female. under its influence the fallopian tubes used to us and the upper part of the vagina are formed. the male structures are trophy and a class or a slave and you rethrow are

y. chromosome pair the fetus develops testes. the testes release testosterone but the underage and receptors on the genital structures are defective rendering the hormone ineffective. because the embryo also produces extra dial the female hormone has a dominant effect the result in spite of having x.y. chromosomes the embryo develops typically female characteristics. the division between pink and blue is nothing new but to to know pink was once the color of choice for male models. and blue was for women like mary the mother of jesus. it was only after the first world war when we remain a false turned blue that things shifted. these days blue is for boys and pink is the girls but why. is this a toy for boys or a toy for girls knowing. girls. i know boy. even preschoolers make a clear distinction between boys and girls at around two and a half years old they begin to feel like they belong to one sex and girls play more with girls and boys more with boys. marketing toys for either boys or girls as a concept that's been around for a

and y. chromosomes we have x. y. which means this is a male embryo if we had two x.'s two greens that would be if. remember. you know we allow people to add on additional things that they want we're allowing them to start screening for eye color there's an additional cost. i remember when we first announced i color and allowing couples to choose the eye color of their baby we actually got a call from the vatican and they were very very nice there were scientists at that but they expressed their concerns and expressed the fact that perhaps society wasn't quite ready for this and asked us to go very slowly and very carefully which of course we always do. there's a huge number of things that we're going after obesity is one of the ones everything else as far as we know is far more complex skin complection very very complex and no one's really identified exactly what causes all of skin what causes white skin what causes black skin and everything in between so we're looking at it but we're not approaching it at this point. i.q. is not going to happen in my lifetime it's tr