Embryos are formed from the reproductive cells of the biological parents, which you may either have available from previous IVF cycles or new embryos must be created.
If you do not have embryos, the future biological mother must undergo hormonal stimulation. The eggs that we obtain through hormonal stimulation are fertilized with sperm from the future biological father.
Sometimes it may happen that the woman of the couple does not have reproductive cells suitable for fertilization, in which case the eggs of an anonymous donor can be used. However, the donor cannot be the surrogate mother as egg donation is legally anonymous.
In the case of sperm, however, the situation is different. The biological father of the child must always be the male of the applicant couple. A non-invasive paternity test is carried out during the pregnancy, which is then used as the basis for the adoption application.