What are homologous organs? How do they help in providing evidence for

1.	What are homologous organs? How do they help in providing evidence for organic evolution?
Answer» Organs having different functions but have similar embryogenic origin and development and having similar relationship with adjacent organs are called homologous organs. They indicate close relationship between their possessors, e.g., the forelimbs Of human, wing of bird, leg of horse and flipper of a seal are all apparently different from one another in structure and function, yet they are all built on the same pentadactyl plan, having the same number of bones, muscles, blood vessels and nerves arranged in the same pattern and developed similarly. Therefore, the most reasonable explanation is that the forelimb of all of these animals were inherited long ago from a common ancestor.

What are homologous organs? How do they help in providing evidence for organic evolution?

Answer»

Organs having different functions but have similar embryogenic origin and development and having similar relationship with adjacent organs are called homologous organs.

They indicate close relationship between their possessors, e.g., the forelimbs Of human, wing of bird, leg of horse and flipper of a seal are all apparently different from one another in structure and function, yet they are all built on the same pentadactyl plan, having the same number of bones, muscles, blood vessels and nerves arranged in the same pattern and developed similarly. Therefore, the most reasonable explanation is that the forelimb of all of these animals were inherited long ago from a common ancestor.

Discussion

No Comment Found

Related InterviewSolutions

A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis to :(A) Remove starch from the plant. (B) Ensure that starch is not translocated from the leaves. (C) Remove chlorophyll from the leaf of the plant. (D) Remove starch from the experimental leaf.
The producer of Lime Fresh’ tea introduces ‘Buy one Get one’ scheme on all the products of ‘Lime Fresh’. Identify the promotional strategy’ used by the producer. State any one objective that could be met by this strategy.
A stringed musical instrument, such as the sitar,is provided with a number of wires of different thicknesses. explain the reason for this.
Mention whether the following would result in inflow, outflow or no flow of cash :(i) Issue of fully paid Bonus Shares (ii) Cash withdrawn from Bank
State with reason whether the following would result in inflow, outflow or no flow of cash :(i) Charging depreciation on furniture. (ii) Cash withdrawn for bank for office use.
Give four points of anatomical differences between a monocot stem and a dicot stem.
State the conditions required for total internal reflection of light to take place.
State the conditions required for total internal reflection of light to take place.
(i) When does a ray of light falling on a lens pass through it undeviated ? (ii) Which lens can produce a real and inverted image of an object ?
When acoustic resonance takes place a loud sound is heard. Why does this happen ? Explain.