EGL USA is one of the largest and oldest independent gemological institutions focusing on gemstone certification and research. Originally part of an international network founded in Europe in 1974, EGL USA opened its first U.S. lab in the heart of New York's international diamond and jewelry district in 1977.
the fusion of the nucleus of a haploid sperm cell and the nucleus of a haploid egg cell, forming a diploid zygote zygote diploid cell formed when the nucleus of a haploid sperm cell fuses with the nucleus of a haploid egg cell tetrad group of four chromatids formed during prophase I of meiosis by the two sister chromatids in each of the two homologous chromosomes
A sperm cell is the male sex cell. All animals (and many other types of organisms) produce what are called sex cells. Sex cells are the cells, that when combined, produce a completely new organism. For example, your mother and every other human female, carry egg cells (female sex cells) in their ovaries. Your father and every other human male carry sperm cells, or male sex cells, in their testes. When an egg cell and a sperm cell unite, the two combine to form an embryo or an unborn, developing organism. At this point, the embryo is able to develop into a fully formed offspring of its parents.