In gestational, host or full surrogacy arrangements, up to three combinations can occur depending on the origin of the gametes used:
- Option 1: if both intended parents are fertile and can contribute their own eggs and sperm, respectively, the resulting embryo will carry their DNA.
- Option 2: If the intended mother cannot provide her own eggs, the embryo will be created using the husband's sperm and donor eggs. The intended mother won't be the genetic mother.
- Option 3: None of the intended parents can provide their gametes. The baby won't be genetically related to them.