Assertion (A): Without variations, evolution is impossible.
Reason (R): Only useful variations are transmitted to the next generation.

Both A and R are true and R is the correct explanation of A

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Both A and R are true but R is not the correct explanation of A

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A is true but R is false

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A is false but R is true

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Solution

The correct option is C
A is true but R is false

Variations are the basic pre-requisite and progressive factor for evolution because without variations no change could occur in individuals and evolution would be impossible. According to natural selection theory, only useful variations will prevail in the long run. However, all the variations arising in the parents at the DNA level are transmitted to their immediate offsprings.

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Similar questions

Q. Darwin and Wallace’s theory of evolution by natural selection failed to explain how
Statement 1: Nature operates to reduce variations in a population every generation.
Statement 2: New genetic variations can appear in a population every generation.
Statement 3: Variations lead to evolution, useful variations are transmitted to the next generation and other variations are eliminated.

Choose the correct option

Q. Assertion :Variations are important for the process of evolution. Reason: Meiosis increases the genetic variability in the population of organisms from one generation to the next.

Select the right option, with respect to the given statements:

Statement 1: Lamarck said that all the acquired characters are inherited by the next generation.

Statement 2: Darwin sais that only useful variations are transferred to the next generation.

Q. Assertion :As favourable variations are transmitted from generation to generation, successive generations become better adapted to the environment, more over, new adaptations may arise due to changing environment. In this way, the adaptive traits preserved by natural selection, will gradually change the characteristics of a species. Reason: This explains the origin of species.

Question 6
Characters that are transmitted from parents to offspring during reproduction show

(a) only similarities with parents
(b) only variations with parents
(c) both similarities and variations with parents
(d) neither similarities nor variations

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Assertion (A): Without variations, evolution is impossible. Reason (R): Only useful variations are transmitted to the next generation.

Assertion (A): Without variations, evolution is impossible.
Reason (R): Only useful variations are transmitted to the next generation.