Question

All vertebrates including human develops a row of vestigial gill slit just behind the head but it is a functional organ only in fish and not found in any other adult vertebrates. It gives the evidence of

• A. Adaptive evolution
• B. Divergent evolution
• C. Convergent evolution
• D. Embryological evolution

Answer 1

The correct option is D Embryological evolution

Divergent evolution results in the formation of different functional structures as an adaptation to the environment in species having common ancestors.

Convergent evolution is the development of similar functional structures in unrelated organisms due to similar adaptations.

Analogous organs are different structurally but perform the same function,they lead to convergent evolution.

Von Baer stated that during embryonic development general characters appear first and the specialised ones later.

All vertebrates including humans develops a row of vestigial gill slit just behind the head but it is a functional organ only in fish and not found in any other adult vertebrates, thus it shows embryological evolution.

Adaptive evolution is an evolutionary process which helps the organism to adapt to a particular habitat.

Hence the correct option is
c. Embryological evolution