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
The union of the sperm and egg cell is caller fertilization Union of the egg and sperm cells is called fertilization.The egg then plants itself on the uterin wall. The two se â¦ ts of DNA combine, then start replicating and dividing to make a baby. 19 people found this useful.he deficiency of sperm cells is called Oligospermia. Oligospermia  is the condition of having less than the normal number of  spermatozoa in the semen.