Can we group eyes of planaria, octopus, insect and vertebrates group together to establish a common evolutionary origin? reason+1
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Development of eye is not a point utilised in classification rather it is an important feature in the evolution.
*Evolution of eye was not successfully explained by Darwin. It is the assumption made by the scientists that first eye-like structure could have been a light sensitive spot on the skin. This could have gone through many changes and complexities to form human eye.
*There was a simplest light-sensitive spot on the skin in ancestral organisms.
*Random changes created a depression in the light sensitive patch making the vision sharper.in animls like planarians
*In insects, the light-sensitive spot gradually evolved into special layer with structures like ommatidia.
*Later, over a period of time, lens was formed in front of the eye.
*Vertebrates and octopuses developed the eye resembling a pin-hole camera. Nerve fibres pass infront of the retina. Cephalopods have an eyes in which nerves are attached to the retina. They do not have a blind spot. Blind spot is present in the retina of the vertebrate eye whereas blind spot is absent in the octopus eye.
*Human eye is a complex structure made up of different structures which individually are incapable of vision. Altogether, the lens, the pupil, the iris and the retina make the vision possible.
Development of eye is not a point utilised in classification rather it is an important feature in the evolution.
*Evolution of eye was not successfully explained by Darwin. It is the assumption made by the scientists that first eye-like structure could have been a light sensitive spot on the skin. This could have gone through many changes and complexities to form human eye.
*There was a simplest light-sensitive spot on the skin in ancestral organisms.
*Random changes created a depression in the light sensitive patch making the vision sharper.in animls like planarians
*In insects, the light-sensitive spot gradually evolved into special layer with structures like ommatidia.
*Later, over a period of time, lens was formed in front of the eye.
*Vertebrates and octopuses developed the eye resembling a pin-hole camera. Nerve fibres pass infront of the retina. Cephalopods have an eyes in which nerves are attached to the retina. They do not have a blind spot. Blind spot is present in the retina of the vertebrate eye whereas blind spot is absent in the octopus eye.
*Human eye is a complex structure made up of different structures which individually are incapable of vision. Altogether, the lens, the pupil, the iris and the retina make the vision possible.
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