I think this is mostly correct.

I think what you mean is that each chromosome has two paired arms that contain alternate versions of functionally the same content. It’s like if you had two cookbooks by different authors that had the same chapters and dishes, but different content. The two versions aren’t in the two strands of DNA, they’re in the two arms of each chromosome.

The problem is that during reproduction, each parent randomly contributes one of the two chromosomes. When each sperm and each egg is made, there’s a 50-50 chance that it gets arm 1 or arm 2 from each chromosome.

If you took a sperm cell that had received all of its content exclusively from arm 1 with an egg that contained content exclusively from arm 2, then I believe that when they fused they would produce what could be called a clone. Some might take issue and point out that the content from the arms gets mixed between the two during this process, so each arm isn’t identical to the first, but we can set that aside for now, I think. The offspring would have all the genes of the original person, and presumably would look identical to them, like a twin.

The problem is that if you were to engage in this exercise (which is tagged “selfcest” if you’re looking for erotic stories about this stuff) in real life, you’d encounter the same problem with incestual reproduction: unless the sperm and egg were prepared in a lab or using magic to ensure that each arm of each chromosome went into a different sex cell, you’d inevitably have cases where the sperm and egg both received their chromosome from the same arm. This means that the offspring wouldn’t have the full duplicated genome of the original parent; on those chromosomes, they’d have half of the parent’s full compliment of genes. And we rely on having two different copies as backups. This is why interbreeding produces birth defects and lower fitness: you miss out on backup copies.

To summarize, you wouldn’t faithfully duplicate yourself, you’d duplicate most of yourself with

So – assuming the offspring was viable – you’d kind of get a lower quality clone: the offspring would probably look like a twin of the original, but they might have worse eyesight. They might have thin, anemic blood. They might have oilier skin and hair, or dryer, itchier skin and hair.