Question

Which of these statements is true about adaptive evolution?

Adaptive evolution is a permanent change in a trait.
Adaptive evolution is a temporary change in a trait.
Adaptive evolution is a fluctuating change in a trait.

Answer 1

Answer: The correct answer is- Adaptive evolution is a permanent change in a trait.

Adaptive evolution can be described as increase in the frequency of alleles that are beneficial to the survival of an organism whereas decrease in the allele frequency that do not give any importance to the survival and reproduction of organism. It results because of natural selection.

Therefore, it depicts a permanent change in a trait as natural selection acts on the heritable traits of an individual.

Answer 2

Adaptive evolution is always changing because the environment is changing continuously.
Hence,
The right answer would be :
Adaptive evolution is a fluctuating change in a trait.