A) Mutations
B) Useful variations
C) Mutations together with natural selection
D) Hybridization
Correct Answer: C
Solution :
Genetic variations i. e., changes in the genes of gametes, introduce genotypic differences in the individuals of a population. Genotypic variations are essential for evolution. Natural selection can operate only on those genetic variations which are expressed in the phenotype. According to Neo-Darwinian theory, the processes that bring changes at the genetic level and are responsible for the origin of new species are mutations, recombinations, gene migration (gene exchange), genetic drift and natural selection. These agents cause changes in alleles, genes, genotypic frequencies of a population and thus bring about evolution through origin of new species.
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