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Evolution
Evidences of Evolution: Embryology
1 question from 1 paper, each with its answer.
- question
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- paper
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Concepts tested
- Recapitulation in tadpole
All Questions
2004 AIPMT 1 question
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Presence of gills in the tadpole of frog indicates that :-The tadpole larva of a frog lives in water, breathes through gills and has a tail and a two-chambered fish-like heart, like a fish.
During metamorphosis it loses the gills and develops lungs.
According to the recapitulation theory (biogenetic law of Haeckel), the development of an individual briefly repeats stages of its evolutionary history. So the gilled tadpole stage indicates that frogs (amphibians) evolved from gilled, fish-like ancestors.
It does not mean that fishes evolved from frogs or that frogs will have gills in future.
So the presence of gills in the tadpole indicates that frogs evolved from gilled ancestors.