Lamarck And Darwin 's Theory Of Evolution Essay

Lamarck And Darwin 's Theory Of Evolution Essay

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The cave fish can be a curious object of study. One of which has scientists rushing to discover exactly why this fish lost the ability to see. The cave fish live in dark caves and have evolved to life without vision. This mysterious regression has scientists scratching their heads. Is this
Both Lamarck and Darwin had excellent theories concerning evolution. In the case of Darwin, he believed that natural selection had the biggest impact on the evolution of a species. Darwin theorized each population had variations, these variations caused the individual to either have a greater or lesser chance of survival. The individual that had the disadvantaged genes would be less likely to live or reproduce and therefore be killed off by predators, or lack offspring. Those individuals with characteristics better suited for the environment had a higher likelihood to live and mate, therefore passing their genes on to the successive generation.
Lamarck held very different views on evolution, holding close the belief that if you don’t use it you lose it, commonly called use and disuse theory. The idea that the characteristics frequently utilized by the species will grow stronger and these strengths will be passed on to successive generations. Those traits that were used less would become progressively less pronounced, eventually disappearing completely if they are not needed. Lamarck also held the idea of acquired characteristics. The evolution of giraffes would be a common example of this theory. Lamarck theorized at one time all giraffes had the same length neck, therefore struggled to reach food from the tops of trees. He hypothesized that the giraffe stretched its neck so much during its lifetime that the neck eventually grew longer and th...

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...c gene responsible for the eye size and the size of taste buds has been responsible for the shrinkage of the eye and the enhancement of the olfactory senses.
Studying the eye loss in cave fish has numerous benefits to humans. On a rare occurrence humans are born with degenerative eye diseases. The genes responsible for the loss of eyes in the cave fish could be linked to the genes that cause eye diseases in humans. Further study may lead to a deeper understanding and therefore improved treatment of human eye diseases.
The cave fish has an interesting trade off of characteristics. Losing sight in an environment with little to no light is a give and take. The loss of sight has helped this species of fish gain an enhanced area of expertise. Bringing with it greater olfactory senses to better smell its food. If the fish cannot see its food it might as well smell it.

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