Can a reproductive system that allows interspecies breeding be made believable?

I have in mind this alien species that can reproduce with humans. The result will always be of the same species as the alien; the human is used only to vary the genetics so the newborn won't be a clone of its mother.

Only females of that species can do this. Males can only impregnate its own species' females. Yes, there are males and females.

The females can do this with certain other species too, from a list of compatible ones (all fictional except for humans). This species was genetically engineered... how its designers achieved this is unknown and an explanation is not a requirement. The topic will just be avoided in my story as the designers are considered a civilization with a level that would take us thousands/millions years to reach.

The above-described features are all story requirements. I may negotiate some but let's try to avoid it. In particular, the "hardcoded" list of compatible species is a story requirement, but let's leave the details of how it works out of this, except if you have an idea that may work. If it helps, pretend this feature is not there.

posted almost 8 years ago

Hatoru Hansou‭

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