This was that children born outside marriage were in some way genetically defective, writes Mary Raftery.

Other risks were present inside the nests themselves: the eggs might not be properly inseminated, or the sperm might be genetically defective.

The embryos, too genetically defective to be implanted in a woman, are usually discarded; they were previously considered too defective to make ESCs.

He believed human matings should be on the same high plane as horse breeding and favored preventing the reproduction of the genetically defective.

She claimed he called her " genetically defective" and a "parasite", and that he verbally abused her in front of their young daughter.

The Nazi Law for Protection Against Genetically Defective Offspring was based on American models for sterilizing the unfit.