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How can the dna be read if the materials needed to read it have not yet been produced? The answer is that they are provided by the mother in the form of mrna and proteins. The early stages of development are controlled directly by the mothers genotype for about the first three weeks, in humans, after which the embryos dna takes over. 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 and body hair plays a role in gender identification. If parents want an early determination of sex (meaning prior to the 18 to 20 week ultrasound for anatomy), chorionic villus sampling (cvs) can also be done from between 11 to 13 weeks gestation.   the second the sperm penetrates the egg is when the embryos sex is determined. All of the sperm contain a sex chromosome - either a y chromosome or an x chromosome. If one with a y fertilizes the egg, the embryo will be a boy. However, we wont necessarily see visible sex differences for weeks or months when the sex differentiation occurs. If you do ivf, they can determine the embryos sex before it is even transferred into the womb, i believe. The practical uses for this are when parents are carriers for a disease that only affects one sex and not the other. During ivf, a doctor creates embryos by combining a womans eggs with a mans sperm in a lab. When those embryos are a few days old, the prospective parents can choose to have them screened. The visibility of these sex organs is also dependent on the thickness of the abdominal wall and the fetal position, so in certain cases, sex cant be determined until nearly the 7-month mark! On the other hand, rapidly developing fetuses can sometimes be identified as early as 11 or 12 weeks, which is good news for those parents who simply cant wait to know what sex their little bundle of. Removal of a cell from an embryo before the embryo is implanted in the uterus allows microscopic evaluation of chromosomes that show whether a baby will be a boy or a girl.

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