The following points highlight the four main theories in mechanism of evolution. The theories are: 1. Lamarck's Theory 2. Darwin's Theory of Evolution 3. De Vries' Theory 4. Modern Theory of Evolution. 1. Lamarck's Theory: Jean Baptiste Lamarck (1744-1829), a French naturalist, made several valuable contributions to biological science, including the coining of the term 'biology' and using the same [...]
In this article we will discuss about:- 1. Evolution of First Cell 2. Origin of Cell Membrane in First Cell 3. Evolution of Metabolism 4. Prokaryotic Cell. Evolution of First Cell: Early living cells were RNA life forms, self- replicating RNA covered by lipoprotein vesicles were the pre-prokaryotes, with time the proteins replaced the catalytic function of RNA, and DNA [...]
The below mentioned article provides a close view on the Polyploidy and Evolution of Species. The polyploidy has played an important role in evolution of new varieties and species in nature. Angiosperms and Pteridophytes have very high numbers of polyploid species in nature. More than 35 per cent angiosperms are polyploids. According to Manton (1950), among all the plant groups, [...]