Fertilization Animation

At conception, the gender and other biologic traits of the new individual are determined. The zygote is genetically complete and immediately begins to divide, forming a solid mass of cells called a morula. When the developing embryo (stage of development between weeks 2 and 8) reaches the uterus, it is a hollow ball of cells known as a blastocyst. Blastocyst forms a structure with two cavities, the yolk sac and amniotic cavity. At conception, the gender and other biologic traits of the new individual are determined. The zygote is genetically complete and immediately begins to divide, forming a solid mass of cells called a morula. When the developing embryo (stage of development between weeks 2 and 8) reaches the uterus, it is a hollow ball of cells known as a blastocyst. Blastocyst forms a structure with two cavities, the yolk sac and amniotic cavity. In humans, the yolk sac is the site of formation of the first red blood cells and the cells that will become ovum and sperm. The sex of the child is determined at the time of fertilization. X + X = female; X + Y = male. Sex differentiation occurs early in the embryo. At 16 weeks, the external genitals of the fetus are recognizably male or female. This difference can be seen during ultrasonography.

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