Which part of Darwin's theory of evolution explores natural selection?

Answer 1

Darwin's entire theory is summed up as, the Theory of Natural Selection.

Answer 2

The theory itself is very very simple.

Very roughly and without too much jargon -

There are a variety of members of a species which are born.
Only some members survive to have offspring and pass on their variations.
Variations over time can lead to organisms so different from one
another that they become separate species.

Presto - the theory of evolution.

Natural selection is the collective term for all natural processes which influence an organism or set of organisms.

For example, a male lion with a very dark mane on his head has been found to be much more attractive to female lionesses, so his chances of having many cubs are greater than his light-maned counterparts.

Natural events also count as natural selection, There is even a term called punctuated equilibirum (think Tsunami's and comet impacts or severe droughts), as well as how well an organism holds up to disease etc.

How well an organism holds up is considered "fitness" to the environment they find themselves in, the term "survival of the fittest" has nothing to do with any particular trait - being smart, or running fast etc, but whether the combination of traits allow the organism to reproduce and do so often.

So biologically speaking some a couple with 20 children - is more biologically "fit" than another couple with 2 kids. Whether that makes them better parents or whether the kids have a hard or difficult life is irrelevant provided they all survive. If they have 20 kids and all but one dies due to disease or starvation or war, then the couple with 2 kids would be considered "more" fit.

Answer 3

Selection presures. It states that a variation in a population is selected for by it's fitness level, and the fitter the variation the more frequent it is and the more faster it's spread in the gene pool. This being the case that the fitter organism has more offspring and hence has more of the variation gene in gene pool.

The gene will be transmigrated throught the population, and over a period of time, would be a staple constituent of the population's genetic make up.

If a population does not have gene exchanges with it's parent population, it slowly diverges from the parent population by accumulating changes within itself and after enough variations are accumulated, it speciates from the parent population. Over a longer period the speciation would ensure that the two populations would then no longer be able to mate.

Answer 4

The full title of the 1859 book:

On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life

Answer 5

all of it, to the two. Evolution exchange into not first posited by utilising Darwin. His contribution exchange into to describe organic determination by way of fact the reason. He seen exchange to be sluggish. It wasn't till Schmalhausen that there exchange right into a guidance of punctuated equilibrium and that factor era exchange into coined basically incredibly these days.

Answer 6

All of it! Try looking at his experiments with birds.