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1. Research has shown that if prescribed dose of an antibiotic is not taken completely, some bacteria might not killed and the disease might return. How does natural selection explain the phenomenon

2. Explain how the scientific theory of evolution is supported by molecular biology

3. Summarize some of the experiences or observations that influenced Darwin during his voyage on the Begale.

1. Natural selection allows some bacteria -more suitable than others- to survive the antibiotic effect and acquire modifications, resistance to antibiotic, reproduce in a generation that acquires such resistance, so the disease reappears.

2. The DNA molecule - a nucleic acid involved in the processes of safeguarding genetic information and inheritance - is one of the study objects of molecular biology, providing evidence of the process of scientific evolution.

3. During his trip on the Beagle, Darwin visited several places, such as the Galapagos Islands, evidenced that some new species bore resemblance to fossils of extinct animals and others exhibited physical and functional adaptations to survive some environmental conditions.

Explanation:

1. Natural selection establishes how some environmental conditions determine a more or less effective reproduction in a species. For this, the characteristic must be able to pass between generations, be variable among the individuals of a species and said variability will determine the differences that allow a better reproduction.

In the case of bacteria, an inadequate dose of antibiotics makes some survive and others do not. Survivors will acquire modifications in their genome that make them resistant to the antibiotic, and their rapid reproduction allows resistance to be inherited in the next generations. For this reason, the disease caused by bacteria will reappear.

2. Evolution implies the physical and functional modifications that occur over long periods of time in living organisms. The evolutionary trait is what makes current species resemble extinct species, which is demonstrable through the molecular biology of DNA.

Molecular biology demonstrates that DNA, genes and how these genes are expressed are common characteristics to all living organisms, which suggests the existence of a common ancestor.

In addition, the comparison between the similarities of the DNA of an extinct and a current animal suggests the possibility of a phylogenetic relationship between the two, in other words, that the current species could evolve from an extinct species.

3. Charles Darwin's travel at H.M.S. Beagle - with a total duration of 5 years and 22 scales - made possible the interest of the naturalist in the process of evolution of the species.

Three of the most important observations to support the evolution process were:

Learn more:

Evolution theory Charles Darwin link

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