Homologous Structures & Common Ancestry — NEET Biology
✅ Asked in NEET 2018Such similarities can be interpreted to understand whether common ancestors were shared or not. For example whales, bats, Cheetah and human (all mammals) share similarities in the pattern of bones of forelimbs. Though these forelimbs perform different functions in these animals, they have similar anatomical structure – all of them have humerus, radius, ulna, carpals, metacarpals and phalanges in their forelimbs. Hence, in these animals, the same structure developed along different directions due to adaptations to different needs. This is divergent evolution and these structures are homologous. Homology indicates common ancestry. Other examples are vertebrate hearts or brains. In
Homologous structures are similar bone patterns (like forelimbs in whales, bats, cheetahs, and humans) that indicate shared ancestors, even though they perform different functions due to divergent evolution. Students often confuse homologous structures with analogous structures—don't mix them up. Homologous = same origin, different function (common ancestor); analogous = different origin, similar function (convergent evolution). NTA asks which structures prove evolutionary relationships: always look for skeletal or organ similarities across vertebrates. Remember: homology = homonymy with ancestry. When you see
The similarity of bone structure in the forelimbs of many vertebrates is an example of: (NEET 2018)
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.