SUPERFECUNDATION AND SUPERFETATION
Do you know that there is a biological explanation for the famous twins with different skin colors? The biology behind them is superfecundation. WHAT IS SUPERFECUNDATION It is the fertilization of two or more ova from the same cycle by sperm from separate acts of sexual intercourse, which can lead to twin babies from two separate biological fathers . There are two types of superfecundation: 1. Homopaternal superfecundation : This is the fertilization of two separate ova from the same father, leading to fraternal twins . 2. Heteropaternal superfecundation : This is a form of atypical twinning where, genetically, the twins are half siblings – sharing the same mother, but with different fathers . Sperm cells can live inside a female’s body for up to five days, and once ovulation occurs, the egg remains viable for 12–48 hours before it begins to disintegrate . Superfecundation most commonly happens within hours or days of the first instance of fertilization with ova rele