Category: Evolution

Some individuals with certain traits have higher survival and reproductive rate than others. They pass on these genetic features to their offspring which brings an evolutionary change into the future generations. This selection of the genetic qualities that prove beneficial for survival in future generations is known as natural selection. Darwin’s Finches is one classic…

It refers to the change in the allele frequency of a population as a matter of chance. It is a random event whose effect is larger in smaller populations and smaller in larger populations. The two examples of genetic drift are the bottleneck effect and the founder effect.

The transfer of genes from one population to another is called gene flow. For eg., pollen moving from one place to another by the action of wind or people moving to different cities or countries. When a person from one country moves to the other and mates with a person there, a transfer of genes…

Mutations are defined as the changes in the DNA sequence of a living organism. The mutations occurring in the germ cells, i.e., the egg or sperm cells only are passed on to future generations. These mutations are inherited from the parents and are present in every cell throughout a person’s life. These are the mutations…

The evolution occurs due to the changes in the gene pool- the collection of genes. There are four key mechanisms that cause changes in gene pool of a population. These include:

The Big Bang Theory is the most accepted theory regarding the origin of life on earth and different forms of life in it. According to the theory, the universe is a result of a huge explosion, which occurred 20 billion years ago. It took another 10 billion years for the origin of the earth. Once earth originated,…

The process by which modern organisms have descended from their ancestors, with changes in their allele frequencies, is called evolution.