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• Adds a bonus 1 DNA to crab evolutions for every 2 mutations that you have.
• Crab evolutions past a certain level give you 1 DNA per evolution.
• This mutations adds +1 to that for every two mutations you have (rounded up).
• Having 35 or 36 mutations adds +18 DNA per gene, for a max of +36 DNA if you have both genes, making a crab evolution total +37 DNA.
• See this article for more information on DNA math.

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Should I Get Them?

Not unless they're in your path. Really this is a rediculously miniscule amount of DNA to waste gene points on.