compare and constract natural selection and genetic drift.expain how each mechan
ID: 208036 • Letter: C
Question
compare and constract natural selection and genetic drift.expain how each mechanisms occurs, using real or hypothetical examples from natural populations and genes to illustrate each mechanisms. your answer should include the three factors necessary for natural selection to operate as well as enviornmental conditions causing the natural selection in your example. how is genetic drift different from natural selection? In what ways are they similar. your answer must be in essay format, a good response will answer the question in the first sentence or two while the rest of the essay will elaborate on the information.
Explanation / Answer
Natural Selection and Genetic drift:
Natural selection is the process by which species adapt to the environment. They increase the capability to reproduce more than the other individuals.
Genetic drift is the process by which there is change in the allele frequency in a population by random sampling.
Difference between Natural selection and Genetic drift:
Both natural selection and genetic drift are the event by which evolution occurs.
Genetic drift is due to random sampling.
Genetic drift is by random selection.
Genetic drift might result in the loss of the important traits.
Genetic drift might result in extinction of the genetic variants.
Genetic drift might be skewed to both directions.
Genetic drift is influenced by population size.
Example:
Natural selection:
Best example is to look at the classic example of natural selection is the long necked giraffes.
Giraffes eat the tree leaves, trees are in great height. The short necked giraffe would have found it difficult to reach. Constant trying to reach the long trees, would have made the giraffes to grow their neck long and had more chance of getting the food. This newly adapted trait is passed to the successive generations. Whereas the short necked giraffes got extinct because they were not able to adapt.
Example: 2
In UK dark peppered moth was rare, during industrial revolution the trees around had the deposits of the amorphous carbon which has resulted by incomplete burning of the organic matter. Because of this event dark peppered moth was able to rest on these trees and had better chance of survival and their population increased greatly.
Genetic drift:
When we are studying the small population of birds in white and brown colour, Both populations have equal chances to mate and produce the offspring’s.
But when the brown colour birds show more reproductive rate than the white ones, and in successive generations, it results in only the presence of the brown colour birds. White colour birds are lost.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.