Chapter : 7. Heredity & Evolution
Evidence Of Evulotion
Evidence Of Evulotion
Homologus Organs :
These organs are similar in structure but disimilar in functions.
Homologous organs are found in forms showing adaptive radiation from a common ancestor so these give evidence of ‘divergent evolution’.
Ex. forelimbs of mammals, bat’s wing, a cat’s paw.
In plants homologous organs may be a thorn or a tendril as they arise in the axillary position. If homology is seen at the molecular level. This is called molecular homology.
Analogous Organs :
These organs are perform similar function but quite different in origin and development.
Analogous organs are also called homoplastic organs.
Analogous organs like wings of insects, birds and bats illustrate ‘convergent evolution’.
Ex. - Wings of birds, wings of insects show the same function but their origin and development is different.
Homologus Organs :
These organs are similar in structure but disimilar in functions.
Homologous organs are found in forms showing adaptive radiation from a common ancestor so these give evidence of ‘divergent evolution’.
Ex. forelimbs of mammals, bat’s wing, a cat’s paw.
In plants homologous organs may be a thorn or a tendril as they arise in the axillary position. If homology is seen at the molecular level. This is called molecular homology.
Analogous Organs :
These organs are perform similar function but quite different in origin and development.
Analogous organs are also called homoplastic organs.
Analogous organs like wings of insects, birds and bats illustrate ‘convergent evolution’.
Ex. - Wings of birds, wings of insects show the same function but their origin and development is different.
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