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That's exactly it, though it could also involve an evironmental factor interacting with the genetics. For example, as mentioned previously, the mother eating a plant that contained a certain toxin.
The ways evolution could be involved in that case are, for example:
1) Animals who dislike the taste of the plant reproduce more successfully, eventually most of the population avoids it.
2) Animals which are less succeptible to the toxin reproduce more successfully, eventually most of the population can eat the plant without problems
Welcome to the Cellar, flesh golem.
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