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Asked by spaghettibolognese to Abyssal Grenadier, Baltic clam, Brachiopod, Common starfish, Naval Shipworm, Orkney vole, Scottish Crossbill, Snake Pipefish, Twisted-wing fly on 2 Dec 2017.
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Common Starfish answered on 2 Dec 2017:
Only identical twins have the same DNA. Non-identical twins have approximately 50% the same DNA, just like other siblings.
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Snake Pipefish answered on 3 Dec 2017:
Identical twins have mostly the same DNA because they come from the same fertilised egg, that splits into two at the beginning of the division process. Non-identical twins comes from two separate eggs that are fertilised more or less at the same time. So they are just like two normal siblings, but happen to be born together.
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