| Medical Practice | Social Practice | |
| 1. Donor Oocyte | Premature ovarian
falure Genetic disease (female) |
Postmenopausal
pregnancy Desired trait (female) |
| 2. Donor Sperm | Male factor
infertility Genetic disease (male) |
Male substitute Desired trait (male) |
| 3. Embryo Biopsy | Genetic diagnosis Gene therapy |
Family balancing
(sex selection) Gene improvement |
| 4. Embryo Replication (?cloning) |
Replicate F.I.S.H.
assay Increase I.V.F. success |
Matched organ
warehouse Age diverse twins Embryo sales |
| 5. Gestational
surrogacy (Host uterus) |
Absent/abnormal
uterus Fetus at risk from mother Mother at risk from pregnancy |
Gestational
substitute (ultimate wet nurse) |
| 6. Embryo Cryopreservation | Avoid repeat I.V.F. cycles | Embryo adoption
(sales) Age diverse twins |