Schweitzer, Lakia and Yarbrough, Suanne (2012) Essence, Key Concepts and Elements of Evolutionary Biology Field. Academic Studio, Delhi, India. ISBN 9788132307044
Preview |
Text
Essencekeyconceptsand_LakiaSuanne.pdf - Published Version Download (4MB) | Preview |
Abstract
Evolution is the process of change in all forms of life over generations, and evolutionary biology is the study of how evolution occurs. The biodiversity of life evolves by means of natural selection, mutations and genetic drift. The process of natural selection is based on three conditions. First, every individual is supplied with hereditary material in the form of genes that are received from their parents then passed on to their offspring. Second, organisms tend to produce more offspring than the environment can support. Third, there are variations among offspring as a consequence of either the random introduction of new genes via mutations or reshuffling of existing genes during sexual reproduction. Natural selection will occur when these facts of nature (heredity, overproduction of offspring, and variation) hold true. Natural selection means individuals do not have equal chances of reproductive success. As a consequence, some individuals produce more offspring and thus have a higher degree of fitness. Traits that ensure organisms are better adapted to their living conditions become more common in descendant populations. For this reason, populations will never remain exactly the same over successive generations. The forces of evolution are most evident when populations become isolated, either through geographic distance or by mechanisms that prevent genetic exchange. Over time, isolated populations can branch off into new species.
| Item Type: | Book |
|---|---|
| Subjects: | Q Science > QH Natural history > QH301 Biology |
| Divisions: | Electronic Books |
| Depositing User: | Esam @ Hisham Muhammad |
| Date Deposited: | 02 Jan 2024 06:12 |
| Last Modified: | 02 Jan 2024 06:12 |
| URI: | http://odlsystem2.utm.my/id/eprint/4325 |
Actions (login required)
 |
View Item |