What is the definition of "derived traits"?

Answer

A derived trait is a feature that appears in the most recent organism, but not in its ancestor as a result of mutation. That is, it is said to be present in an organism, but absent in the last known ancestor of the organism. The same is also the case for traits that may have been present in the predecessors, but absent in current organisms.
Q&A Related to "What is the definition of "derived traits"?"
Derived traits are those that just appeared (by mutation) in the most recent ancestor.
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Derived traits are traits that appeared in the most recent common ancestor of the group and was passed on to it's decedents. Ancestral traits are inherited directly from the ancestor
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Why is it some people can try addictive substances and resist returning to them, while others are hooked from their first encounter? It is only logical to suppose these people differ
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Relative to other apes, upright walking and sparse body hair. Relative to primates, trichromatic color vision. Relative to other mammals, inability to synthesize vitamin C and forward-directed
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