Question

Theory of natural selection dwells on
(a) role of environment in evolution
(b) natural selection acting on favourable
variations
(c) changes in gene complex resulting in
heritable variations
(d) none of these

Answer 1

Theories of natural selection dwells on

option :(b) natural selection acting on favourable variation .

because of the following reason

*According to Darwin's theory of evolution, more individual are produced in each generation that can survive.

*Only the organisms beast adapted to their environment trend to survive and transmit their genetic characters.

Answer 2

Answer is option "b"

Explanation:

• According to Darwin's theory of evolution, more people are created in every age that can endure. Phenotypic variety exists among people and the variety is heritable.
• Just the living beings best adjusted to their condition will in general endure and transmit their hereditary characters in expanding numbers to succeeding ages while those less adjusted will in general be eliminated.
• Hence, the right answer is option b" natural selection acting on favourable variations."