Question

According to Dollo’s Law:
Statement 1: "Evolution is irreversible and irrevocable"

Statement 2: Once an organism has evolved, it never returns to its former state, even if they are placed in conditions of existence that are identical to those in which it has previously existed

• A. Both the statements are correct
• B. Statement 1 is correct and statement 2 is incorrect
• C. Statement 1 is incorrect and statement 2 is correct
• D. Both the statements are incorrect

Answer 1

The correct option is A Both the statements are correct

Evolution is the unrolling or unfolding of nature that brings about a change from one form or condition to another. Environment is never static, it always keeps on changing, so organisms need to adapt according to the changing environment, some changes are brought into their bodies that can be naturally or induced by the help of mutation.
A Belgium paleontologist Louis Dollo proposed the law of irreversibility in the year 1893, which states an organism follows an irreversible type of evolution. Dollo’s law is also known as Dollo's principle. According to this law, the organism never gets back to its original state, even if the conditions are favourable to its previous conditions, still it does not return to its original state. Organisms cannot go back to their original form because there are some irreversible changes or steps that have taken place in the course of evolution.
Dollo’s law is contradicted by devolution. According to devolution, an organism can revert to their original forms over the course of time, if necessary, according to the needs of the organisms.