Bio's lap report Lab Example | Topics and Well Written Essays - 250 words

Bio's lap - Lab Report Example During this time, 23 chromosomes from a man pair up with 23 chromosomes of a woman, resulting to 46 chromosomes. In the process of meiosis, each chromosome make an exact copy of itself keeping it attached at one point. They create an X-shape when they condense and get together, genes are exchanged. The cell divides twice each time, resulting to 23 egg/sperm cells. Male constantly produce egg at puberty while female start producing egg during fetal life (approximately 700 million). Every month, one of the woman’s ovaries select an immature egg to lavish, to feed by the hundreds of cells until it grows fat and get ready. It oozes out of the ovary, to the end of the fallopian tube, and to the uterus. Tentacles capture the egg and pull it inside due to the muscular contraction of the tube and the constant swaying of the cilia. This time, the egg is ready to be fertilized by a sperm but it will die within a few hours if not fertilized by a sperm. During sexual intercourse and excitement, sperm squeezed out of the storage and is swept out by glandular fluids such as prostate down to the 15-inch long tube and out through the penis. A teaspoon of fluid with 300 million sperm cells are immediately impaired because of the acidic vagina. Other barriers include the cervix passageway to uterus that is lock-shut or plug with mucus that keeps bacteria or sperm out and the protective barrier of the egg itself. But during ovulation, the mucus becomes watery, leaving a channel that can guide sperm through the uterus. It would take 2 days of swim for sperm to reach its goal but the propelling of the uterine muscles enable the sperm to reach the fallopian tube within 30 minutes. Only the sperm that can break the zona (thick protein coat of the egg) and can match the protein of the egg is the sperm that can fertilize the egg and fuse with the egg’s inner layer. The fertilized ovum needs to create a viable embryo by ordering the zona to lock-out other sperm and by