Speciation

Explain the following :

1. Speciation
2. Natural Selection

Answer

• Speciation - evolution of a new species from pre-existing species
• Occurring due to accumulation of variations
• By processes like genetic drift / geographical barriers like mountains, rivers etc., leading to incapability to reproduce amongst themselves in the population.

Natural selection

• Change in frequency of some genes in a population
• Which give survival advantage to a species from elimination.
• Ex. – in a population of beetles, a new variation (green colour) get survival benefit / advantage to green beetles whereas other (red) perishes.

• Exam Year: 2015