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Campo de estudios, Aprender Matemáticas, Inglés y Ciencias Math tutorials, resources, help, resources and Math Worksheets THE BRAIN FROM TOP TO BOTTOM Sexual reproduction in human beings is made possible by the fusion of two reproductive cells, or “gametes”—the ovum from the mother and the sperm cell from the father. This fusion results in the formation of a zygote with 46 chromosomes: half from the mother and half from the father. The zygote thus acquires a unique genetic identity, so that it is far more accurate to speak of the sex act as one of procreation (the creation of a new being) rather than one of reproduction, which would imply simply producing the same thing over again. One day after fertilization, the zygote begins a series of mitotic divisions in which the considerable volume of cytoplasm from the ovum is divided among the multiple daughter cells. In humans, the embryo reaches the 16-cell stage, also called the morula, on the third day after fertilization. At the blastula stage, starting at 128 cells, the ball of cells develops an inner cavity called the blastocoele. Source: adapted from

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