Question

Doctrine of evolution i.e., descent with modification is concerned with:
A. Biogenesis
B. Sudden change
C. Gradual changes
D. Mutational changes

Answer 1

Hint: The theory of evolution by natural selection, first formulated in Darwin’s book ‘’On the origin of species’’ in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits.

Complete Answer:
- Evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. The theory of evolution is based on the idea that all the species are related to each other and gradually change over time.
- Evolution theory in biology postulates that the various types of plants, animals, and other living things on the planet earth have their origin in other pre-existing types and that the distinguishable differences are due to modifications in successive generations.
- Genetic variations can arise from gene mutations or from genetic recombination. only hereditary mutations, which occur in egg or sperm cells, can be passed to future generations and potentially contribute to evolution.
- The theory of evolution is one of the fundamental keystones of modern biological theory. So we can say that evolution is the change over time. Hence, the doctrine of evolution that is descent with modification is concerned with the gradual changes until new or different species were formed.

So the correct answer is option ‘C’ i.e gradual changes.

Note: In general, evolution is the process of gradual development of something or in biology, it is the process by which different kinds of living organisms are believed to have developed from earlier forms during the history of the earth.