twin formation

Twin formation occurs when a fertilized egg splits into two separate embryos early in development. This can happen naturally and results in identical twins, who share the same genetic material and are usually the same sex. The split can occur at different stages of cell division, influencing the type of twins formed. Fraternal twins develop from two separate eggs fertilized by two different sperm and are genetically similar like siblings. Factors such as genetics, maternal age, and certain fertility treatments can influence twin formation. Essentially, twins form when a single fertilized egg divides or when two eggs are fertilized simultaneously.