In a manner relating to or based on genotype; from the perspective of genetic makeup rather than appearance.
Formed by adding the adverb suffix '-ally' to 'genotypical.' This follows the standard English pattern of converting adjectives to adverbs describing how something occurs or is done.
If you said 'these twins are genotypically identical,' you'd mean they have the exact same DNA, even if one has a suntan and the other doesn't—the adverb lets you talk specifically about the genetic level!
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