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Competition + Variation.
Classic example:
Giraffes not always had long necks. There were variation in the species. When food sauces grew low competition increases and those with longer necks survived (more fruit/food at the top of trees) as they were more suited to the conditions. These long necked giraffes then breed and the offspring have long necks, thus natural selection of a "fitter" species. Hense - survival of the fittest.
What else can I help you with?
In order for evolution by natural selection to occur what has to happen?
There must be genetic variation, the variation must be heritable, and there must be differential reproduction (due to competition).
Is descent with modification caused by natural selection?
No, it's the other way around: descent with modification is what you need for natural selection to happen.
What are the four things that must happen for natural selection to occur?
For natural selection to occur, there must be genetic variation present in a population, some of which is heritable. This variation must lead to differences in survival and reproduction (differential fitness). Individuals with advantageous traits must pass those traits on to their offspring. Over time, these advantageous traits become more common in the population.
What must happen for evolution by natural selection to take place?
For evolution by natural selection to occur, there must be genetic variation within a population, some of which must be heritable. The environment must exert selective pressure on the individuals, favoring those with advantageous traits that increase their chances of survival and reproduction. Over time, these advantageous traits will become more common in the population due to differential reproductive success.
What happen to an individual that is poorly suited to its environment?
They die. This is called Natural Selection.
Which is more likely to be true natural selection or evolution?
Evolution, of course. Evolution can happen without natural selection in some cases; drift, flow. Generally though, natural selection causes evolution and then, by definition, would come first.
What must be true for natural selection to occur A. The alleles must give no competitive advantage. B. There must be no mutations in the populations. C. There must be limited resources in the ecosyste?
For natural selection to occur, C. There must be limited resources in the ecosystem is true. Limited resources create competition among individuals for survival and reproduction, leading to the selection of traits that enhance fitness. Additionally, variation among individuals and the ability to pass on advantageous traits are also essential for natural selection to drive evolutionary change.
What is one factor that affects natural selection and artificial selection?
Variation in the organisms under selection. In both artificial selection and natural selection there must be heritable variations that have the possibility of being in the case of artificial selection what the selector wants in the organism and in thje case of natural selection survivability and reproductive advantages.
What is the name for the process in which the organisms best adapted to their environment survive?
Its NaTuRaL sElEcTiOn if you didn't know.
What must occur for the gene pool within population to change?
natural selection or genetic drift
What is an example of the position of the eyes on a trilobite that gives clues about where it must have lived?
Natural Selection :D
Why does natural selection not directly affect genes?
Natural selection acts on the way organisms interact with one another and with their environment. The genes of organisms are not usually themselves involved in this interaction: they direct it through intermediaries such as proteins. So natural selection must work through these intermediaries to affect genes.
