The following points highlight the five main zoogeographical realms of animals. The realms are: 1. The Holarctic Realm 2. The Ethiopian Realm 3. The Oriental Realm 4. The Neo-Tropical Realm 5. The Australian Realm. 1. The Holarctic Realm: This realm is often broken up into the Palearctic realm (Old World) and the Nearctic realm (North America), and are separated [...]
The below mentioned article provides a quick note on the origin of species. Origin and Accumulation of Genetic Diversity: It is presumed that gene mutation caused by cosmic radiation and other mutagens, modifier genes, inversion of parts of chromosomes, translocation of genes from one chromosome to another, elimination or reduplication of chromosomes, introduce genetic diversity in natural populations. The accumulation [...]
In this article we will discuss about:- 1. Chemical Hypothesis 2. Chemical Evolution of Life 3. Biological Evolution of Life 4. Evidences of Organic Evolution 5. Theories of Organic Evolution 6. Natural Selection 7. Inheritance of Acquired Characters 8. Criticism of Lamarckism 9. Neo-Lamarckism. Contents: Chemical Hypothesis Chemical Evolution of Life Biological Evolution of Life Evidences of Organic Evolution Theories [...]