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In mammals, when the egg is released from the ovary it is surrounded by a loose group of follicle cells. The cell grows during maturation, the amount of cytoplasm increases. One comprises everything, it is all there is, whereas the millions of sperm cells are infinitive, have no importance on their own. However, some researchers have found [ citation needed ] that in rare pairs of fraternal twins, their origin might have been from the fertilization of one egg cell from the mother and eight sperm cells from the father. When an egg is fertilized by a sperm, it begins to divide into a group of cells called a blastocyst, which is the stage right before the embryo is formed. This study also provides another way to closely examine how the environment impacts and changes genes, and why we inherit very specific gene expressions -- a phenomenon that's the basis for a growing field of research known as epigentics. When the cells find each other, they fuse after a while and the chromosomes come together.

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The ovum and sperm Size and shape The egg cell or ovum, or oocyte is the largest human cell.

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The oocyte now undergoes its second meiotic division producing the haploid ovum and releasing a polar body. Oogenesis, the development of the egg cell in the ovary from the Internet Konig gives a similarity between the development of the ovum and the evolution of the earth, as it is described by Rudolf Steiner in Anthroposophy: He compares this to the Warmth Stage of the earth, or the Saturn Stage. They lie separated from each other in follicles and are surrounded by a layer of nutritive, so called follicular cells. Cortical granules inside the secondary oocyte fuse with the plasma membrane of the cell, causing enzymes inside these granules to be expelled by exocytosis to the zona pellucida.

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