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.Know More
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 about Biology
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 >
Some examples of Monera are halobacteria, methanobacteria, pyrococcus and methanosarcinales, which are considered members of the domain archaea. Other monerans are all known bacteria. Members of monera are single-celled prokaryotes, which means that their cells have no nuclei or organelles protected by membranes.Full Answer >
Natural selection leads to evolution because the traits of those who are able to reproduce influence future generations genetics and gradually lead to these passed on traits becoming the normal state of being, thus causing the species in question to evolve. If a group of people have predominantly brown hair genes and have children, then by way of natural selection the dominant gene will increase with future generations, meaning that slowly in time this group of people will evolve to have mostly brown hair genes.Full Answer >
The three major types of symbiosis are mutualism, where both species benefit, commensalism, where one species benefits and the other is unaffected, and parasitism, where one species benefits and the other is harmed. Symbiotic relationships can occur within an organism's body or outside of it.Full Answer >