Question

Define the following terms:

1)Natural Selection

2)Reproductive Isolation

3)Geographical Isolatio

4)Speciation

Answer 1

1. Natural selection: It is a basic mechanism of evolution in which nature selects the characteristics of an organism. If the behavior of a certain organism is approved by nature, the organism will survive or else will die, hence not selected by nature.
2. Reproductive Isolation: When some members of a particular species are not able to mate with other members of the same species due to environmental barriers or due to other geographical barriers , it is known as reproductive isolation .
3. Geographical Isolation: Rise of mountain, continental drifts, river flow change and other topographical changes cause isolation of population resulting in speciation. This type of isolation is known as geographic isolation. It is one of the most important cause of speciation.
4. Speciation: It may be defined as an evolutionary process, which involves the formation of one or more species from an existing species.