Question

In building a phylogenetic tree, biologists look for traits derived from a common ancestor. To use this form of analysis with the utmost fidelity, scientists must differentiate homologous traits from convergent ones. Which of the following would be considered a homologous trait?

• A. The wings of birds and bats
• B. The ability of birds and dolphins to echolocate
• C. The streamlined body form of fish and dolphins
• D. The flippers of Dolphins and the wings of bats

Answer 1

The correct option is D The flippers of Dolphins and the wings of bats

The flippers of Dolphin as well as the bats have same internal or skeletal structure. However, the flippers of Dolphin help in swimming while that of the bats are used for flying.

A divergent evolution/having homologous structure is observed in organisms belonging to the same lineage or those having same ancestors.

So, the correct answer is 'The flippers of Dolphins and the wings of bats'