Theory of evolution, Biology

Evolution: This deals with the origin of newer types of organism from the previous ones by modification involving genetic changes and adaptations. Evolution also called as biological & organic evolution it is the change over time in one or more inherited traits found in populations of organisms. Evolution can occur when there is variation or change of inherited traits within a population. The big sources of such variation are genetic recombination, mutation or gene flow. 

 There are four general mechanisms of evolution. The first mechanism is called as natural selection, this is a process in which there is differential survival or reproduction of organisms that differ in one or more inherited traits. The second mechanism is genetic drift, it is a process in which there are random changes to the proportions of two & more inherited traits within a population. The third mechanism is known as mutation that is a permanent change in a DNA sequence. And finally, the fourth mechanism is gene flow this is the incorporation of genes from one population into another.

Posted Date: 7/3/2012 1:26:35 AM | Location : United States







Related Discussions:- Theory of evolution, Assignment Help, Ask Question on Theory of evolution, Get Answer, Expert's Help, Theory of evolution Discussions

Write discussion on Theory of evolution
Your posts are moderated
Related Questions
Determine number of sucrose molecules in the solution When a solid is dissolved in a volatile solvent the vapour pressure of the solution is less than the vapour pressure of th

What is the importance of the glucose blood level for human health? The glucose blood level (glycemia) must be kept normal. If it is abnormally low there is not enough glucose

Systemic Infection Serious infections increase total body metabolism and thus impose hemodynamic burden on the heart. Increased heart rate associated with infections is an addit

Define the Elimination of Vitamin E? The primary oxidation product of α-tocopherol is α-tocophery quinone that can be conjugated to yield the glucuronate. This glucnronide is e

Planning of the Nursing Care 1) Educate and teach the parents 2) Provide preoperative and postoperative care. Educate an Teach the Parents The parents may be

Lumpy skin disease The disease, reported from Sudan in 1970 and Egypt in 1988, is caused by a member of the Capripox virus. It affects cattle and is restricted to African coun

Phylum Cyanobacteria Cyanobacteria  are prokaryotes,  but  they are not  like bacteria  in  the usual  sense of  the word.  The cyanobacteria  lack chloroplasts,  and  their  l

State  in brief about the Macronutrients  Each element is specific in its function in plant metabolism, however, the exact functions for a number of them are still not known. T

Define the objectives of eyelids, lacrimal apparatus and tear film dynamics. By familiar with section, you should be capable to understand: a. All the functions of the eyeli

introduction in fungai