OK, think of it like this instead. Obviously fuck accuracy, for ease we’ll call them cavepeople. Two different cavepeople that are genetically distinct from humans have sex, resulting in a genetically human fetus. That doesn’t suddenly change the cavepeople into humans, they’re still genetically different. It’s a caveperson’s fetus, but it’s a human fetus. Same thing with the egg. Genetically, the thing inside is a chicken and, genetically, the things that made the egg are not.
OK, think of it like this instead. Obviously fuck accuracy, for ease we’ll call them cavepeople. Two different cavepeople that are genetically distinct from humans have sex, resulting in a genetically human fetus. That doesn’t suddenly change the cavepeople into humans, they’re still genetically different. It’s a caveperson’s fetus, but it’s a human fetus. Same thing with the egg. Genetically, the thing inside is a chicken and, genetically, the things that made the egg are not.