The alien genes are arranged in a numerical sequence.

She discovered in one of the species, somehow, alien genes had been introduced.

The war begins at the injection site and death comes before the alien genes can keep the body alive.

The Ovipositor tended to favor the alien genes over the native life-forms when it could.

They bore alien genes, but that DNA had come from two mighty self-determined parents.

Replacing native with alien genes narrows genetic diversity within the original population, thereby increasing the chance of extinction.

Or was it she, not the absent paternal parent, who had polluted the "pure" bloodline with her alien genes?

The underlying Earth stock was tinged with alien genes.

Closing his eyes wouldn't help a bit, but if he could not, then it was hard to relax and let reflex and alien genes take over.

Quatermass himself almost succumbs to the mass psychosis, attempting to kill Roney, who does not have the alien gene and is immune to the influence.