Answer: Biological Evidences of Evolution. i. Palaeontological evidence of evolution. a. Fossils are defined as the dead remains of plants and animals that lived in the past in various geological layers. b. Unlike the evidences from other branches of biology, evidence […]
Tag: biology question and answer
Write a note on “Genetic drift”.
Answer: Genetic Drift. i. Any alteration in allele frequency in the natural population by pure chance is called genetic drift. ii. For example, elimination of a particular allele from a population due to events like accidental death prior to mating of […]
Define Gene pool. Explain the terms: Gene pool and Gene frequency.
Answer: Gene Pool & Gene Frequency. Gene Pool: The sum total of genes of all individuals of interbreeding population is called gene pool. i. It refers to the sum total of genes of all individuals of interbreeding population. ii. Changes […]
Explain modern synthetic theory of evolution.
Answer: Modern Synthetic Theory of Evolution. Julian Huxley proposed term ‘modern synthesis’. This theory was based on the work of Dobzansky. The salient features are as follows. i. According to the Modern synthetic theory of evolution, population is considered as […]
Describe the concept of “Survival of the fittest”.
Answer: Survival of the fittest. Survival of the fittest or Natural selection: i. The organisms having favourable variations succeed in the struggle for existence. ii. The organisms with unfavourable variations are unfit to survive and they perish. iii. This means […]
Write a note on “Struggle for existence”.
Answer: Struggle for Existence. Intra-specific struggle: It is the competition among the individuals of the same species. This type of struggle is very severe, because the need and approach of all competing organisms is precisely same. e.g. struggle between cow and cow, […]
Describe Darwin’s theory of natural selection. State the objections raised against this theory.
Answer: Darwin’s theory of natural selection. Charles R. Darwin was a British biologist. He postulated the “Theory of origin of species by natural selection”. Principles of Darwinism: Darwin’s theory of organic evolution by natural selection is based on the following principles: i. […]