Paper Topic:

evolution

EVOLUTION

Evolution (Name (Course (University (Date )Evolution

All types of organisms that are present here on Earth are descendants of their ancestors that lived more than 150 million years ago . Plants and animals today all came from single-celled organisms that lived more than 3 billion years ago . Evolution is the study of how organisms live through adaptation (Smith , 1993 . These adaptations allow organisms to change physically and physiologically over generations in to live (Krukonis Barr , 2008 . This biological evolution is the change in the genes of specific species from generation to generation

. A gene is a basic unit of heredity in organisms . Evolution occurs when the frequency of genes are altered in a specific time period . Microevolution is the result of evolution in short time frames with small gene alterations While in macroevolution , evolution occurs in long time frames with prominent gene alterations . Frequency of genes can also be affected by environmental changes "The History of life : looking at the patterns

Evolutionary change 's basic mechanisms are natural selection , genetic drift , mutations , recombination and gene flow . Organisms provide offspring that are similar but not identical . Nature selects characteristics that allow organisms to survive . These changes may be physiological or physical . Genetic variations for survival over several generations can bring about new entirely different species . Small populations with a small number of offspring tend to experience genetic drift . The change in the gene frequency occurs because of random sampling . The genes of the offspring are a random sample of the...

6 pages

40.5 KB

Free sing-up