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Key factors related to plant appearance and characteristics impact natural selection in.

If we hold evolution as a condition for selection, we will issue the curious ruling that a system governed by the first sort of model falls within the scope of evolutionary theory while a system governed by the second sort of model only does so up until it reaches a stable intermediate state but then no longer.

That's because these moths could easily camouflage against the background of a lichen of a similar color that grew abundantly in their environment.

If this process happens to occur in a consistent direction—say, the largest individuals in each generation tend to leave more offspring than smaller individuals—then there can be a gradual, generation-by-generation change in the proportion of traits in the population.

Another attack, or set of attacks, on the ability of natural selection to explain have to do with the threat that selectionist explanations are circular.

" Unfortunately, the events of 2008 proved that when it comes to natural selection, size doesn't always matter.

, involving conscious intent or goal-oriented mechanisms as causal factors; see also Bartov ,.

The mutation in this case occurred in the parent specifically, in the germline but its effects did not become apparent until the next generation.

Select from these resources to teach your classroom about this subfield of evolutionary biology.

However, mutations have also occurred, which are undirected i.