What is difference between Analogous Organ and Homologous Organ?

Analogous Organ:

1. Organs similar in shape and function but their origin, basic plan and development are dissimilar. Example. Wings of butterfly bird and bat.

2. Such similarities are because of convergent evolution for adaptation to a common condition.

Example: Flying

Homologous Organ:

1. Organs dissimilar in shape, size and function but their origin, basic plan and development are similar. Example: Fore limbs of frog, reptile, birds and mammals.

2. Such differences are due to divergent evolution or adaptation for varied conditions.

Example: Leaping in frog, crawling in reptiles, flying in birds, running and grasping in mammals.