write a short note on evolution of eye (4 marks)
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Many researchers have found the evolution of the eye attractive to study because the eye distinctively exemplifies an analogous organ found in many animal forms. Simple light detection is found in bacteria, single-celled organisms, plants and animals. Complex, image-forming eyes have evolved independently several times
Major stages in the evolution of the eye in vertebrates.
The earliest known fossil of complex eyes date from the Ediacaran, with the appearance of the stem mollusk Clementechiton sonorensis. [2] Diverse eyes are known from the Burgess shale of the Middle Cambrian, and from the slightly older Emu Bay Shale.[3] Eyes vary in their visual acuity, the range of wavelengths they can detect, their sensitivity in low light, their ability to detect motion or to resolve objects, and whether they can discriminate colours.
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evolution of eye:- the first fossils of eyes found on the data from the ediacaran period (about a thousand years ago) even with this Pessimistic values, the vertebrate eye Would Still evolve from a the patch of a photoreceptor cells in less than 364000 years.
Charles Darwin knew that with his theory of evolution he was able to explain that once an eye was created by random chance then selective pressure would give rise to the diversity same within different species. but which one that logic was basic problem.