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

Asked by Anupama Ray | 26th Feb, 2011, 04:27: AM

Expert Answer:

Dear student,
Homologous structures are structures having a similar origin, similar development, similar internal structure and basic plan but showing different external form and function. Example - Forelimbs of mammals, birds, reptiles and amphibians.
Yes, it is necessary that they have a common ancestor, since otherwise there cannot be any similarity in basic plan, origin or internal structure.
Regards, Team Topperlearning

Answered by  | 26th Feb, 2011, 01:10: PM

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