Genetically modified organisms 2 essay

This means that, since she has no skin pigment, under ordinary environmental conditions she is completely white with pink eyes. Alba is not green all the time. She only glows when illuminated with the correct light. When and only when illuminated with blue light maximum excitation at nmshe glows with a bright green light maximum emission at nm.

Genetically modified organisms 2 essay

January 7, ] volution is the cornerstone of modern biology. It unites all the fields of biology under one theoretical umbrella. It is not a difficult concept, but very few people -- the majority of biologists included -- have a satisfactory grasp of it.

One common mistake is believing that species can be arranged on an evolutionary ladder from bacteria through "lower" animals, to "higher" animals and, finally, up to man. Mistakes permeate popular science expositions of evolutionary biology.

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Mistakes even filter into biology journals and texts. For example, Lodish, et. Misunderstandings about evolution are damaging to the study of evolution and biology as a whole.

Genetically modified organisms 2 essay

People who have a general interest in science are likely to dismiss evolution as a soft science after absorbing the pop science nonsense that abounds. The impression of it being a soft science is reinforced when biologists in unrelated fields speculate publicly about evolution.

This is a brief introduction to evolutionary biology.

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I attempt to explain basics of the theory of evolution and correct many of the misconceptions. Evolution is a change in the gene pool of a population over time. A gene is a hereditary unit that can be passed on unaltered for many generations.

The gene pool is the set of all genes in a species or population. The English moth, Biston betularia, is a frequently cited example of observed evolution. The frequency of the dark morph increased in the years following. Their frequency was less in rural areas. The moth population changed from mostly light colored moths to mostly dark colored moths.

The moths' color was primarily determined by a single gene. The increase in relative abundance of the dark type was due to natural selection.

The late eighteen hundreds was the time of England's industrial revolution. Soot from factories darkened the birch trees the moths landed on. Against a sooty background, birds could see the lighter colored moths better and ate more of them.

As a result, more dark moths survived until reproductive age and left offspring. The greater number of offspring left by dark moths is what caused their increase in frequency. This is an example of natural selection. A single organism is never typical of an entire population unless there is no variation within that population.

Individual organisms do not evolve, they retain the same genes throughout their life. When a population is evolving, the ratio of different genetic types is changing -- each individual organism within a population does not change.

For example, in the previous example, the frequency of black moths increased; the moths did not turn from light to gray to dark in concert.Genetically Modified Organisms.

Whenever humanity begins to approach a global food shortage, we seem to come up with some new technology that drastically improves our food production.

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