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Evolutionary computation
Published in Richard E. Neapolitan, Xia Jiang, Artificial Intelligence, 2018
Richard E. Neapolitan, Xia Jiang
Evolution is the process of change in the genetic makeup of populations. It is believed that the changes in genetic makeup are due to mutations. As noted earlier, natural selection is the process by which organisms that have traits that better enable them to adapt to environmental pressures such as predators, changes in climate, or competition for food or mates will tend to survive and reproduce in greater numbers than other similar organisms, thereby increasing the existence of those favorable traits in future generations. So, natural selection can result in an increase in the relative frequencies of alleles that impart to the individual these favorable traits. The process of the change in allele relative frequencies due only to chance is called genetic drift. There is some disagreement in the scientific community as to whether natural selection or genetic drift is more responsible for evolutionary change [Li, 1997].
Glossary of scientific and technical terms in bioengineering and biological engineering
Published in Megh R. Goyal, Scientific and Technical Terms in Bioengineering and Biological Engineering, 2018
Genetic drift or allelic drift is the change in the frequency of a gene variant (allele) in a population due to random sampling. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation.
Understanding the role of genetic susceptibility (ACE2 and TMPRSS2) in COVID-19
Published in Egyptian Journal of Basic and Applied Sciences, 2022
Abdullahi Tunde Aborode, Sherifdeen Bamidele Onigbinde, Khadijah Omoshalewa Sanusi, Noah Alaba, Aderinola H. Rasaq-Lawal, Babatunde Samuel Obadawo, Allison Olatoyosi, Saidat Omowunmi Adeniran-Obey, Victor Onwukwe, Uchenna Asogwa, Ridwan Iyanu Arinola, Seun Idowu Imani, Ayoola S. Fasawe, Ibukunoluwa Sodiya, Sherif Babatunde Adeyemi, Gaber El-Saber Batiha
The effect of different genetic variants among other populations occurs due to genetic drift [19]. Genetic drift occurs in diverse peoples, where there is the infrequent occurrence of alleles that face a chance of being lost. Once it starts, genetic drift will continue until the involved alleles are either lost by a population or are the only alleles present at a present or particular gene locus within a population [19]. Both possibilities decrease the genetic diversity of a person. Genetic drift can result in the loss of rare alleles and can reduce the size of the genetic pool. It also causes a new population to genetically district from its original population, which has led to the hypothesis that genetic drift plays a role in the evolution of more recent species [19].