Challenging and redefining Dollo's law of evolution: re-appearance of lost structures.

Abstract excerpt

According to a modern interpretation of Dollo's Law of irreversibility in evolution, a lost structure, is unable to reappear in evolution due to the accumulation of mutations in the genes required for its formation. However, several reports have challenged this law, even in vertebrates. Lost structures have been reported to re-appear in natural populations, as well as through spontaneous mutations, genetic...

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