Darwin's Four Factors of Evolution
by: Jose Pablo G
Potential for Population Growth
- Biotic Potential has to do with the amount of resources available and the environmental conditions present. Each species however has different biotic potentials due to their reproductive span, frequency of reproduction, litter size and survival rate.
- Carrying Capacity on the other hand is the maximum number of a given species a certain area can support. Carrying capacity affects the potential population growth for species because it determines a limit.
- Lastly, population impact is the last affecting variable in the potential for a species to grow. The impact other species have on a given population will determine resources, growth factors and live span.
Natural selection does not however create perfectly adaptable organisms, but rather shifting genetic information to create favourable phenotypes that are able to cope with their environments. Another reason why genetic variation does not create perfectly adaptable organisms is because of the allele constraints present in the genetic pool of the species that in essence, maintains a stable allele combination that will never be perfected.
Darwin and Wallace claim that offspring that inherited the modified allele phenotype and had an advantage when competing for the limited resources will in fact survive. Thus, this surviving organisms with "advanced" or stronger inherited genetics will produce offspring that will compete with the less advanced organisms of the same species.
In addition, because the characteristics and traits that are inherited and passed from generation to generation, this will lead to a change in population over several generation which Darwin called "descent with modification".
Proliferation of Organisms
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