The four principles of natural selection are variability among members of a species, heritability of the variable features, differences in population members' ability to reproduce and survival of the fittest in terms of variability, heritability and reproduction. Natural selection is one of evolution's four mechanisms.
Natural selection acknowledges the fact that members of a population are capable of producing more offspring than are needed to maintain a healthy population size. Nature controls the population's size by empowering species' best specimens to survive and reproduce.
Variability among population members refers to differences in such traits as eye color or hair color, and it serves as natural selection's foundation. The variable traits must be heritable, which means they are passed down from one generation to the next. Differences among population members' ability to reproduce refers to the fact that some population members are able to reproduce and some are not. These three factors combine to help ensure the survival of the fittest, which means that the population members with the most desirable traits reproduce and create new members that share those traits, whereas members with undesirable traits fall into obscurity.
Other mechanisms that contribute to evolution include genetic mutations among members, migration of the fit populations and genetic drift, which is a random process that results when one species' genetic material finds its way into other populations.Learn More
Natural selection occurs given heritability, variation, significant population growth and individual differences in survival and reproduction. Despite its common definition as survival of the fittest, natural selection has more to do with reproductive success than survival.Full Answer >
Natural selection works by imposing different rates of success on genetically diverse organisms. Given a certain amount of hereditary variation amongst members of a population, some individuals naturally thrive, while others die young or fail to breed.Full Answer >
Natural selection is the process by which helpful variations are disseminated throughout populations at the expense of neutral or harmful variations. The process improves the chance for beneficial mutations to survive succeeding generations, and it tends to weed out the less desirable traits.Full Answer >
One advantage of cloning includes the protection of endangered species from extinction because the members of the species can have their cells cloned to create other members. Cloning also helps in improving food supply. One disadvantage is that the diversity of genes is lost when the process is carried on regularly. A risk of extinction is highly possible in the case of disease outbreaks due to similar genetic makeups.Full Answer >