Anatomical Evidences Body organisation Vertebrate organsystems Homologous organs the organs of different animals having similar position structure and embryonic origin are called homologous organseg vertebrate forelimbs the forelimbs of sealbirdbathorse and man ID: 1014970
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1. Evidences of Organic evolutionAnatomical Evidences:Body organisationVertebrate organ-systemsHomologous organs: the organs of different animals having similar position, structure and embryonic origin are called homologous organs.e.g. vertebrate forelimbs the forelimbs of seal,bird,bat,horse and man.
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3. Analogous organs the organs which have the same function and are superficially alike but are different in fundamental structure and embryonic origin e.g. Insect. and bird wings
4. connecting links the living animals which possess characteristics of two different groups of animals are known as connecting links e.g. Peripatus connecting link between annelids and arthropods.Lung fishes connecting link between fishes and amphibians .Egg-laying mammals duck billed platypus.
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6. Vestigial organs The organs which occur in reduced form and are useless to the possessor ,but correspond to the fully developed functional organs of related animals are called vestigial organs.e.g.Vestigial organs in human body e.g. tail bone, canine , wisdom teeth, hair and mammae in man ,nictitating membrane , vermiform appendix etc.
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8. Atavism Reversion ,reappearance of certain ancestral characters e.g tail bone
9. Embryological Evidences resemblance among vertebrate embryos
10. Recapitulation Theory Put forward by Van Baer, lateron called biogenetic law by Hackel.Ontogeny repeats phylogeny.
11. Retrogressive metamorphosis (Herdmania)
12. Physiological or biochemical Evidences metabolic processesEnzymesHormonesBlood and LymphBlood proteinsBlood groupsOxyhaemoglobin crystalsUrinary waste