Polyembryony is the phenomenon of two or more embryos developing from a single fertilized egg. Sexual reproduction starts within a zooid with an internally fertilized egg. John Rock was the first to extract an intact fertilized egg. The other mechanism is the blocking of sperm in the fertilized egg. Any fertilized egg has the potential to become a queen. The fertilized egg cell is known as the zygote. A fertilized egg immediately begins the process of embryogenesis, or development. The more generally accepted theory is "fission", in which the fertilized egg splits partially. This can keep a fertilized egg from implanting or result in miscarriage. The life cycle of this insect has four stages&colon; fertilized egg, larva, pupa, and adult. After mating, the fertilized egg remains in a suspended state until August or September.