What are homologous structures? Give an example. Is it necessary that

1.	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 similar structures in related organisms. The most important thing to remember about homologous structures is that they share common ancestry. • In other words, only organisms that are somehow related to each other can have homologous structures. • For example, a chimpanzee’s arm and a human’s arm are homologous structures. • Both sets of arms have a similar structure and use and chimpanzees and humans share a common ancestor. Yes, it is necessary that they have a common ancestor, since otherwise there cannot be any similarity in basic plan, origin or internal structure.

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 similar structures in related organisms. The most important thing to remember about homologous structures is that they share common ancestry.

• In other words, only organisms that are somehow related to each other can have homologous structures.

• For example, a chimpanzee’s arm and a human’s arm are homologous structures.

• Both sets of arms have a similar structure and use and chimpanzees and humans share a common ancestor.

Yes, it is necessary that they have a common ancestor, since otherwise there cannot be any similarity in basic plan, origin or internal structure.

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