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rizzlepuff8 rizzlepuff8
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12 years ago
- be sure to define natural selection and evolution.
in a paragraph form please.
and evolution?  my main question..how is natural selection a mechanism of evolution?
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wrote...
12 years ago
natural selection is defined as: The process of organisms that become better adapted to their environment and increases their chances of survival and production of more offspring. and as the organism adapts to the environment, in all, structural, physiological and behavioural adaptations tend to be considered as an organism's growth and evolution of its species as of evolution is the theory of how an organism is thought to of derived and diversified from simpler forms during the history on earth.
wrote...
12 years ago
Natural selection is the result of Nature "selecting" organisms that are better adapted to their environment because they have characteristics that allow them to survive and reproduce moe than  other organisms.  Since these adaptations are genetic, they are passed on to future generations;  the entire population eventually changes or evolves.
wrote...
12 years ago
Natural selection refers to the natural forces and environmental limitations that act upon the different phenotypes of the members of a population. NS permits some phenotypes rather than others reproduce success. This environmentally directed differential survival selects for changing frequencies of expressed alleles in the gene pool.

Natural selection is always the sum of all the many environmental pressures favoring one phenotype rather than another. It is the total sum of all the pressures (limitations) on the entire combined phenotype the organism inherited and that it passes on. This makes the next generation's phenotype more suited to their habitat than the ancestor was, as long as the ecology remains stable.

Natural selection is the environments vigorous way of sifting through the population to 'sift out' the least suitable phenotypes in each generation because they fail to gather sufficient resources to have reproductive success.
wrote...
12 years ago
Evolution:  changes in allele frequencies in a population over time

Does natural selection change allele frequencies in a population over time?  Yep.  Therefore natural selection is a mechanism of evolution.

Selection:  Some individuals have inheritable traits that grant them a reproductive advantage or disadvantage in the local environment.  Over time, the more advantageous traits will become more prevalent in the population.  Natural selection is a subtopic of this, and it's the natural local environment that is providing the selection pressures.  The other subtopics of selection are artificial selection (selective breeding), and sexual/mate selection.
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