Describe the principles of natural and artificial selection?
Natural selection occurs when ecological pressures "select" for one trait over another. For example, if it is cold, an animal with a heavier coat will survive longer than one with a thin coat. The one with the heavy coat will have more offspring and that gene will be more frequent in the gene pool than the gene for a thin coat.
Artifical selection occurs when a desirable trait is selected and an undesirable one is not. For example, a long flowing coat on a dog may be more desirable to a breeder than a short, ragged coat. The breeder selects the genes.
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.
Natural selection and artificial selection both involve an organism's traits being determined by how much they're favored. Then, the organisms with favorable traits pass those traits on to future generations. However, natural selection is caused by survival; the organisms with traits that increase their chances for survival and reproduction pass on their traits. As for artificial selection, humans purposefully decide which traits (like the most colorful one) of an organism to pass on. The similarity…
Nature plays no direct role in artificial selection. That is the difference between artificial selection and natural selection. Nature does play some indirect roles in artificial selection. One indirect role is in providing the organisms with which one beings the artificial selection. Another is in influencing the choices of the organism performing the artificial selection.
They are both basically the similar, except artificial selection involves human intervention while natural selection is, as the name implies, natural. Nature selects only those organisms with favorable traits that help them survive and are likely to reproduce and pass these traits onto their offspring , so it is called natural selection . When human beings select an organism to produce next generation it is called Artificial selection . Perhaps for coat color or height.
Natural selection is when contemporary species rose from ancestors that survived due to their physical characteristics in their habitats. A well-known example is the Galapagos Islands and how the animals on the islands adapted to their environments. Darwin convinced the biology world that diversity in organisms came from evolution (descent without modification). Artificial selection is when humans intentionally breed animals for certain traits. Unlike natural selection, where only the fittest survive, artificial selection is for…
These plants and animals were subjected to artificial selection so that the traits humans wanted in the organisms were selected for and the organisms not having these traits were culled. This, with some modification, is a good analogue for natural selection and artificial selection shows how organisms can be shaped over time with the proper selective pressures. The selective pressure of humans in artificial selection and the selective pressure of the environment in natural selection.
As an example of the selective mechanism, but artificial selection is directed by men and usually has a definite goal in mind. Natural selection is the selection of favorable variants, something like artificial selection, against the backdrop of the immediate environment. Artificial selection selects traits beneficial to the men doing the selection, while natural selections selects traits beneficial to the organism. Still, genes are changed over time in populations with both methods.
Natural variation in artificial selection is used because humans choose from among the naturally occurring variation s in species. Natural selection is related to species fitness because Darwin called natural selection survival of the fittest because those that could survive would carry their species on there for being the naturally selected.
Maybe u should actually answer because i'm to tupid to know the answer/ The artificial selection although controlled by the choices of humans created novelty in the races. During natural selection the environment is responsible for selecting the best types. Darwin's ideas of natural selection were based on the fact of struggle for existence and survival of the fittest. Thus by artificial selection some of the races have been developed which can sustain the present…
Heritability deals with the genes so that in natural and artificial selection, if something is heritable, it may be passed down to the children (through the genes). In natural selection, many theories such as Darwin's propose that animals and people subconsciously choose those heritable traits they most wish to see replicated in their offspring. In artificial selection, the general idea is to pick those genes carrying the heritable traits (such as eye/hair color, diseases, etc.)…
Artificial selection. Artificial selection is the selection, by humans, of which individual plants or animals to breed from. In this way desirable characteristics, such as increased yield or disease resistance, can be preserved or improved. Charles Darwin used artificial seletion as a model for how evolution could take place in nature, where competiton between individuals replaced the selective action of humans. He called the natural process 'natural selection'. See http://evolution.berkeley.edu/evosite/evo101/IIIE4Evochange.shtmlfor an excellent account.