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
1 The pollen tube then breaks into the ovule through the micropyle and then the micropyle bursts into the embryo sac. 2  In the embryo sac, on the male nucleus fuses with the nucleus of the egg and forms a diploid zygote. 3  This process is known as true fertilization or syngamy. In the embryo sac, on the male nucleus fuses with the nucleus of the egg and forms a diploid zygote. 2  This process is known as true fertilization or syngamy. 3  The other male gamete or nucleus enters further into the embryo sac and it fuses with secondary nucleus.