Question

Explain the importance of homologous organs in the process of evolution.

Answer 1

Hint: Homologous organs are considered to be evidence from comparative anatomy in the evolutionary process. If any similarity is found in organisms belonging to different groups, it is considered that there is a relationship between those organisms. These relationships can be understood from studying homologous structures.

Complete explanation:
Homologous organs are organs that are similar in structure but different in function. Let us consider the following example- forelimbs of man, cheetah, whale and bat. The forelimbs of the mentioned organisms possess similar anatomical structures and have similar bones. But, their function differs. The forelimb of a human is used to hold things, write; that of a cheetah is used to run and walk; a whale uses its forelimbs to swim and a bat uses its forelimbs to fly.

Homologous organs are an important example in the evolutionary process because it leads to divergent evolution. Organisms having homologous organs are thought to come from the same ancestor. These organs also help in knowing the phylogenetic relationship between different organisms.

Additional information:
Analogous organs are opposite of homologous organs. Analogous organs are organs that are different in structure but perform similar function. For example, wings of birds, bats and butterflies have different anatomical structures, but all perform the same function of flying.

Note:
The importance of homologous organs in the evolutionary process is to show the relationship between different organisms and prove they all had a common ancestor. The process through which interbreeding species split into two or more evolutionary groups is referred to as divergent evolution. Divergent evolution results from homologous organs.