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Unpolluted Forest Case Study

1040 Words5 Pages

The selection strength was higher in the unpolluted forest because the difference between relative fitness of the fittest moths and the least fit moths was higher (0.66). Selection strength is how strong the environment is pressuring evolution. In this case, the unpolluted forest is pressurizing evolution more, which means the dark moths will survive longer because through evolution they will adapt to the habitat and start turning lighter and hide better from predators, and the longer they survive the more they can reproduce. It is the other way around in the polluted forest. Since the selection strength is lower it is not pressurizing evolution as much, so the light moths won’t adapt as fast and will still be vulnerable to predators because they stand out so much. Because …show more content…

This is wrong because an organism doesn’t have to have the best fitness or survive the longest to pass on a gene successfully to the offspring. Usually nature chooses the traits to pass on to offspring, it passes traits that will be beneficial to the organism for survival. A true statement would be; natural selection can fully be explained by how successful the genes are passed to the offspring.

b) This statement is true. Variation is necessary for natural selection to occur because natural selection has to do with the difference in traits. Without variation all the generations would stay the same and natural selection would not happen. The changes in phenotype in the next generation is because of the changes in frequency of alleles (or variation).

c) This statement is also true. Adaptation is defined as a trait that increases the survival in a particular environment. For example, adaption can happen if a plant is in a cold habitat where there is less precipitation, it can adapt to those circumstances by growing shorter to avoid cold winds and growing longer roots to get more water. The plant has adapted to survive in the conditions in its

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402 Words | 2 Pages

In the dirt habitat, the population of fork and knifes began to decrease while the population of spoons began to increase. For instance, in generation 2, forks accounted for 33% of the population, knives had become extinct and spoons accounted for 67% of the population. Additionally in generation 3, the total population was made up of spoons, both knives and forks had become extinct (Table 1A). As for predators in the dirt habitat, the population of pinto bean decreased during the second generation, while the populations of black beans, green beans and white beans slightly increased.

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Difference Between Directional Selection And Disruptive Selection

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Directional selection and disruptive selection are two of the three types of natural selection. Although both of them result in a population adapting to biotic and abiotic environments, they differ in many ways. Directional selection occurs when one extreme phenotype is favored over the other phenotypes, whereas disruptive selection occurs when two or more phenotypes are favored over the others. Another difference is that disruptive selection favors polymorphism and directional selection causes species to evolve over time and leads to the extinction of those lacking the phenotypes causing the distribution curve to shift.

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Compare And Contrast Directional Selection And Disruptive Selection

732 Words | 3 Pages

In a directional selection there is only one trait and it is always that dominant trait that dictates body of the population. The best example to show this is that in the area that giraffes live in the vegetation is in the higher trees so the giraffe has adapted a neck that is long enough to reach the vegetation that is crucial to its survival. It’s a lot like being graded on a curve where Directional selection is only going to have one peak to its curve but disruptive would have two peaks. 1. Many pathogenic bacteria

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Are We Still Evolving Summary

103 Words | 1 Pages

In the article, Are We Still Evolving, Michael White claims that culture and the environment has a impact on genetic makeup. This relates to the content of our course in which White is talking about Evolution and genetics. He writes that the act of people migrating has caused the human gene to change and change the way evolution works on human genes. This can be true. This relates to the environment having so much power in how people come to be.

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918 Words | 4 Pages

Depending on the conditions of the environment, the organisms may pass down selected traits to their offspring. These selected traits will allow for the next generation to better adapt and survive longer ["Natural Selection and Speciation - Biology."]. One example of evolution through the process of natural selection is that of the Viceroy butterfly. The Viceroy butterflies were facing extinction a little more than 100 years ago due to their inability to protect themselves or hide from their predators; mainly birds.

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930 Words | 4 Pages

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1126 Words | 5 Pages

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1176 Words | 5 Pages

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1265 Words | 6 Pages

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2023 Words | 9 Pages

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