Q. 7 5.0( 4 Votes )

What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor?

Answer :

Homologous organs are those organs that have same basic structural design but have different appearance and functions. Example, forelimb of amphibians, bird and reptiles.

Yes, homologous structures always have a common ancestor. In the given example, the basic structure of forelimb of amphibians, birds and reptiles is similar but they are modified to perform different functions in various vertebrates. Thus, this shows that they have evolved from a common ancestor.

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