Learn about the future benefits if only the fit survived
Natural selection is a key factor in evolution and is defined as the different survival and reproduction of individuals due to differences in phenotype (physical form and structure of an organism, its developmental processes, its biochemical and physiological properties and its character traits). It causes the properties of an organism to change over generations. The term was popularized by Charles Darwin, which contrasts with artificial selection, where survivability is seen as intentional. In natural selection, nature determines an organism’s ability to survive.
Why is it necessary
Variations are common in any population of organisms. One reason for this is the mutation in the genome of an organism that can be passed on to its offspring. While the organism lives, its genomes interact with its environment and cause variations in their properties. The environment consists of the molecular biology of the cell, other cells, other individuals, populations, species and also the abiotic environment.
Natural selection is based on phenotype, but any genetic factor that gives the phenotype a reproductive advantage would become a common element in a population. This leads to a microevolution over a certain period of time, during which the populations achieve a particular ecological advantage. Simply put, natural selection is necessary for populations to develop.
Animals were selectively bred as scientists believed it would increase their chances of evolution. However, a recent study found that this is only half the case. Certain proteins under strong selection helped organisms mutate more quickly by increasing their robustness. Robust proteins have higher chances of functioning and can generate new properties.
This clears an age-old controversy and confirms that evolution depends on your physical fitness and ability to develop faster.