give 3 examples of plans in embryonic evidence

Dear Student,

Embryological studies helps in providing evidence for evolution in the following ways-

1.heredity and reproduction are both inter-related and embryo is a part and parcel of reproduction

2.embryo generalises the characters transfer from parent to offspring

3.transfer of genes takes place in embryo formation.

4. Development of homologous and analogous structures.

 

Homologous	Analogous
Similar in anatomy	Dissimilar in anatomy
Doing dissimilar functions	Perform similar functions
Develop in related animals	Develop in unrelated animals
Inherited from common ancestor	Not inherited from common ancestor
Similar developmental pattern	Dissimilar developmental pattern
Similar structure and origin	Dissimilar structure and origin

Examples: 
Wings of birds and wings of bat : These are analogous organs as they have different structures but perform same function.

Tail of chameleon and hand of man are  analogous as they perform same function of grasping but have different structure.
Forelimb of frog, reptiles, bird and human are homologous organs as they have same structure but perform different function.
Flippers of whale and fins of fish are homologous organs as they have same origin but they perform different functions.






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