Baby making in humans essays

Baby making in humans essays There are some major differences between males in females in the way their sex cells are produced. In males this process occurs in seminiferous tubules. The females occurs in the ovaries, but are not fertilized there. The first difference is in cell division. The males cells divide in to two equally sized identical cells that are attached. The females cells are not the same size and unattached, one cell is larger than the other. The smaller cell is referred to as the polar body. There is no difference in crossing over between the two sexes, they both occur in Prophase I of meiosis. There is also no difference in the independent assortment of the cells, this occurs in metaphase of meiosis I in both sexes. In meiosis II the cells in both sexes divide a second time. The males cells divide again to form two equally sized cells adding up to a total of four cells. This process occurs in the female as well. The females larger cell will divide to form a polar body and a larger cell. This new large cell is the egg cell. The original polar body will either divide in to two more polar bodies or cease to exist. The female cell will create just one egg, while the male creates four sperm. Males will begin making sperm at puberty. They make trillions of sperm. Females begin making eggs much earlier. They begin making eggs before they are born! They have about 2 million eggs only a few months after they are born! However, this number is reduced to about 400,000 when they reach puberty. Another fascinating fact is that female eggs rest in prophase I much longer than the male sperm. Female eggs rest from birth until puberty. The one egg will complete meiosis I each month, but they dont go through metaphase II unless they are fertilized by a sperm. In males this whole cycle takes about 74 days. There are roughly 8 million genetic combinations in each egg and sperm after independent assortme...