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.
With twins, a common question parents have is whether the twins are identical or fraternal. DNA Diagnostics Center offers a twin zygosity DNA test that definitively determines whether twins are identical or fraternal. A twin zygosity DNA test is a simple procedure performed sometime after the babies are born. Some parents choose to start testing right away, while others prefer to wait to initiate testing until the twinsâ features emerge later in life.