What is the ruling on transferring an ovum from a wife who cannot conceive to the man's second wife for fertilization in her womb, and who is the mother in this case, and what are the implications for inheritance, knowing that the father is one and one of the wives can carry while the other cannot due to medical reasons?

Transferring an ovum from one woman to the womb of another is prohibited. If it occurs, the maternity is subject to deliberation. The more preponderant opinion is that the owner of the ovum is the mother, as she is the source of the fetus's genetic characteristics, and the pregnant woman is merely an incubator for its development. This is supported by the resolution of the Fiqh Academy that the lineage of the child is established from the sources of the two seeds.