Question

According to the neo – Darwinian theory which of the following is responsible for the origin of new species.
A. Mutations
B. Useful variations
C. Mutation together with natural selection.
D. Hybridization

Answer 1

Hint: The theory of neo-Darwinism is generally used to describe any integration of Charles Darwin’s theory of evolution by natural selection with Gregor Mendel’s theory of genetics.

Step by step answer:According to Neo-Darwinism evolution occurs by natural selection of genetically modified characters or genotypes. According to Neo-Darwinism, the formation of new species is by the accumulation of inherited random mutations and also by genetic recombination occurring due to independent assortment or crossing over during the process of fertilization. Due to the accumulation of adaptive variation in the gene pool makes the organism better for survival to the existing environmental character. So, according to the theory of Neo-Darwinism, mutations together with natural selection is responsible for the origin of new species. Natural selection refers to the differential survival of organisms that is best suited to the environment due to the change in the genetic makeup of organisms.
Hence, the correct answer is ( C )

Additional information:
Darwinism is a theory of biological evolution developed by English naturalist Charles Darwin. According to Darwinism all species of organisms arise and develop due to the natural selection of small inherited variation that increases the individual's ability to compete, survive, and reproduce.
According to Darwin survival of the fittest was used for the organisms which were fittest in reproduction. The organism which produces more offspring has a better chance of not getting extinct.

Note: Branching descent and Natural selection are the two concepts of the theory of evolution of Darwin.