The following points highlight the six main factors that cause genetic divergence in species. The factors are: 1. Mutation 2. Recombination 3. Genetic Drift 4. Natural Selection 5. Hybridization 6. Polyploidy. Genetic Divergence: Factor # 1. Mutation: Gene mutations bring about genetic divergence. It is due to the changes in the chemical composition of gene by substitution, insertions, deletions and [...]
In this article we will discuss about the meaning and mechanisms of isolation of species. Meaning of Isolation: The first step in the development of a new species is isolation. A population should split up into two or more separate demes each with its own gene pool. These demes must be isolated from one another. If genes are exchanged between [...]
In this article we will discuss about Protective Colouration and Mimicry. Protective Colouration: One of the morphological characters of the animal is the colouration. Animals living in tropics show a wide range of colours. Colouration helps the animal in different ways. But all colours are not biologically important. Colour Production: Colouration may be due to physical colours or chemical colours. [...]