Question

According to theory put forth to explain the mechanism of organic evolution, when structure of a gene under goes a change, the trait it represents also changes. This results in a heritable variation in population, and may lead to the formation of new species from pre existing species.
The above theory is known as

• A. Theory of origin of species by natural selection
• B. Mutation theory
• C. Theory of inheritance of acquired characters
• D. Theory of biogenesis

Answer 1

Answer: (B)

Mutation theory

Hugo de Vries stated this theory of Mutation. According to him, new species are not formed by continuous variations but by sudden appearance of variations, which he termed as mutations. He stated that the mutations are heritable and persist in successive generations.
Thus, the correct answer is option (B).