1.How can evolution explain the formation of complex structures such as the eye
ID: 49791 • Letter: 1
Question
1.How can evolution explain the formation of complex structures such as the eye or the flagella motor?
Group 1:
2.What causes variation in a species? To put this another way: all humans have the same genes, yet we do not look alike. What is the reason for the phenotypic differences between individuals of the same species? What is genetic recombination?
3. What are the dangers of small populations of a species from a genetic and evolutionary standpoint? What is the bottleneck effect?
4.. How does speciation occur? What is the importance of geographic isolation? How is this illustrated in the Galapagos?
5. What is Darwinian Medicine and how does it help us better understand medical conditions?
Explanation / Answer
1. The complex modification of flagella with time exlains the evolution of complex structures like eye. Complex structures like eye are evolved from simple structures or proteins based on the their use during the course of evolution. In prokaryotes photosensetive receptors are present which are sensitive to light. photorecptor cell is the basic light processing unit of the eye. It contains two types of molecules called opsin and chromophore. opsin is sensitive to light and the other pigment chromophore function is distinguishing the colours.
2. Reason for the phenotypic differences between individuals of the same species is during development mutations occurs causing infrequent genetic differences and variation in gene copy number. During meiosis gene exchange occurs which is also a reason for phenotypic differences.
Genetic recombination is the genetic process in which offsprings are produced from the parents in which combination of traits of offsprings are different from those of the parents. Genetic recombination in eukaryotes occur during meiosis.
3. If the population is small then the alleles in the population may be eliminate easily in genetic evolution. Bottleneck effect occurs when Natural disasters or Human activities which causes a huge reduction in population, In which the resulting population represents the genetic makeup of the initial population very rarely.
4. Genetic changes in in two inter breeding populations of a species results in the evolution of two different species is known as speciation. Geographic isolalation leads to the genetic changes in the population and leads to the evoluation of new species.
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