Check sibling questions

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

 

Answer:

Homologous structures are the structures that have the same structural plan and origin but have different functions.

Example: Wings of birds and forelimbs of humans perform different functions but they have similar skeletal structure because they have the same origin.

HOMOLOGOUS STRUCTURES - Teachoo.jpg

Yes, it is necessary that homologous structures always have a common ancestor.

As the above example suggests, the basic structure of both are the same but they were modified to perform different functions . Hence, this shows that they have both evolved from a common ancestor.

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HOMOLOGOUS STRUCTURES Human Bird

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CA Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo