<Li> Polyspermy results from multiple sperm fertilizing an egg . </Li> <P> However, some researchers have found 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 . This possibility has been investigated by computer simulations of the fertilization process . </P>

The product of the union of ovum and sperm a fertilized ovum