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Identical twins share nearly all their DNA, usually above 99.9%, with tiny differences from early cell changes.

Humans share roughly 40–60% of their genes with bananas, but only a small slice of total DNA is closely alike when entire genomes are compared.

Full siblings share about half of their dna on average, though the exact percentage can swing several points above or below that.

A child inherits about half of nuclear DNA from each parent, with small twists for sex chromosomes and mitochondrial DNA.

Most full siblings share around half of their variable DNA, with real values often landing between about 38% and 61%.

You share about 12.5% of your dna with each great grandparent, though real dna segments can range widely around that average.

On average, you share about 25% of your dna with each grandparent, though real results range from roughly 15% to 35% due to random recombination.

Siblings share about 50% of their dna on average, but real matches vary from roughly 37–61%.

Half siblings usually share about 25% of their DNA, with real results often falling between roughly 17% and 34%.

Each child shares about 50% of their dna with each parent, though the exact pieces passed down are unique for every person.