"Some researchers say that our dna predisposes us to sacrifice for our blood kin."
God! How brilliant they must be to reach that conclusion! (sarcasm) After all, squirrels, birds, cats, and most other animals are generally predisposed to sacrifice for their blood kin, so why on earth wouldn't humans be?
They do research to find out things like this? DNA is simply part of the whole pattern, and the pattern is formed by purposeful consciousness. The DNA is like a fingerprint of that consciousness.