fertilization of an egg by a sperm

birth cell children conceiving conception eco egg embryo extracorporal extracorporeal fecundation female fertile fertilisation fertility fertilization fertilize fructification genetic gyn gynaecology gynecology impregnation insemination ivf maternity medical medicine midwifery motherhood obstetrics oocyte ootid operative ovary ovulation ovule ovum parentage parenthood pregnancy pregnant procreation reproduction science semen sperm tocology