Rhonda J. Pomerantz, MD is a practicing Dermatologist (Skin Specialist) in New York, NY. Dr. Pomerantz graduated from New York University School of Medicine in 1989 and has been in practice for 28 years. She completed a residency at Suny Health Science Center. Dr. Pomerantz also specializes in Internal Medicine.
Identical twins form when one egg has been fertilised by one sperm and the zygote splits into two. This happens at the very earliest stage of development, when the zygote is no more than a cluster of a few cells.
Fraternal twins form when she releases two (or more) eggs. Each one is fertilized by a separate sperm. Genetically, fraternal twins are no more alike than siblings (brothers and sisters). Identical twins start off as one fertilized egg.o start off, let's first talk about fraternal twins, another word for this is dizygotic which means a fraternal twin happens when two separate eggs are fertilized by two separate sperm. These babies can come out because of different reasons such as hyper-ovulation (it is hereditary).