Tag: darwin's theory of evolution

The Descent of Man and Selection in Relation to Sex is a book by English naturalist Charles Darwin, first published in 1871, which applies evolutionary theory to human evolution, and details his theory of sexual selection, a form of biological adaptation distinct from, yet interconnected with, natural selection. The book discusses many related issues, including evolutionary psychology, evolutionary ethics, differences between human races, differences between sexes, the dominant role of women in mate choice, and the relevance of the evolutionary theory to society. Thus, option A is correct.

Darwin proposed the theory of natural selection to explain the process of evolution. According to Darwin’s theory of natural selection, all organisms have the potential to reproduce limitlessly irrespective of the fact that each species maintain a constant density over time. However, the struggle for existence, i.e. the competition among individuals for available resources to survive and reproduce, put a check on species density and maintains it at a constant level. Survival of fittest is unequal ability of individuals to survive and reproduce based on suitability of their inherited characters to prevailing environmental conditions. It imparts the reproductive advantage to certain organisms which account for major part of the gene pool of the species. Thus, natural selection favors the individual with survival and/or reproductive advantage over others under existing environmental condition. Thus, the correct answer is option D.

Charles Darwin visited Galapagos islands, the chain of 22 islands located in the Pacific Ocean on the west coast of South America, during his voyage on HMS Beagle. Since Galapagos islands were once connected with South America mainland, many birds of the island resembled those of mainland. This observation laid the foundation of his concept of adaptive radiation and his theory of evolution. Thus, the correct answer is option B.

Darwin proposed the theory of natural selection to explain the process of evolution which was published in the book entitled The Origin of Species by Means of Natural Selection, 1859. Linnaeus is considered as the father of taxonomy and was first to use the binomial nomenclature for organisms in his book “Species Plantarum, 1753” in which he gave a generic name to each species. Philosophie Zoologique was published by Lamarck in 1809 in which he proposed his theory of evolution, Lamarckism.Thus, the correct answer is option A.

Charles Darwin came up with the idea of evolution of species with natural selection. Therefore, (c) is the correct answer.

Speciation is the term used for the development of new species by changes in population. Charles Darwin was the first to describe role of natural selection in speciation. Therefore, (b) is the correct answer.

Charles Darwin was born in year 1809. His bicentenary year was 2009.

British naturalist Alfred Russel Wallace worked on a diversity of plants and animals of Malay Archipelago, reached at the same conclusion as Darwin. Wallace's book, "Contributions to the Theory of Natural Selection", was published in 1870.

'Descent of man' was another publication by Darwin after he published 'Origin of species' in 1859.

Phyletic evolution actually refers to slow gradual evolution. It is a theory stating that, evolutionary change happens slowly, steadily and gradually in an attempt of the species to continue to adapt to changes in the environment, until they gradually become new species.