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mamaluj [8]
3 years ago
15

After taking antibiotics for several weeks, a patient develops a severe bacterial infection in his intestines. The doctor claims

the antibiotics changed the microbiome of the patient’s gut, causing the infection to develop. What evidence would the doctor need to support the claim? Explain how competition and succession played a role in developing the bacterial infection.
Biology
2 answers:
Leokris [45]3 years ago
5 0

Answer:

Before the antibiotic, the ‘good’ bacteria had colonized her intestines and formed colonies that made up her biome. These colonies out-compete other bacteria, including ‘bad’ bacteria that tried to grow in the intestines hence protecting her intestines from infection.

However, the antibiotics wiped out the established colonies of ‘good’ bacteria –destroying her biome- and gave room for recolonization of the intestines by bacteria. The secondary succession gave a chance for the ‘bad’ bacteria to also thrive and cause her massive infections.

Yanka [14]3 years ago
4 0

Our intestines have a beneficial bacterial flora, that is, the bacteria present there do not affect our organism, but they do audit us in some functions. However, when a person has bacterial infection in the intestine, it means that that person has had their body invaded by harmful bacteria that are causing their illness. At this point, all of these bacteria begin to compete for space and food and many of them end up dying in the process.

However, when the patient takes antibiotics to end the infection, these drugs end up killing most of these bacteria, even the beneficial ones, leaving the intestine unbalanced and susceptible to bacteria resistant to this antibiotic.

Resistance happens, because some of these bacteria may not have been exposed correctly or environment, or have been exposed to a non-lethal dose, or have suffered some kind of mutation that makes them resist the drug. In this, the current natural selection, allowing non-resistant bacteria to die, while resistant ones survive and generate other resistant bacteria, creating a flora that is not attacked by the antibiotic.

If the harmful bacteria survive they will create a whole community of harmful bacteria that will cause an even more serious infection.

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Classify the following characteristics depending on if they describe events occurring in mitosis, meiosis I, or meiosis II.
Temka [501]

Answer:

Mitosis events are:

Results in 2 genetically identical

diploid nuclei

A diploid number of sister

chromatids align at the spindle

equator during metaphase

Meiosis I events are:

Results in 2 genetically diverse

haploid nuclei

Homologous chromosomes align

at the spindle equator during

metaphase

Homologous chromosomes pair

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Crossing-over occurs during

synapsis

Meiosis II events are:

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A haploid number of homologous

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Explanation:

Mitosis is a type of cell division which produces two daughter cells that are genetically identical to the parent cell. In mitosis, the chromosome number of the parent cell is maintained in the daughter cells i.e. a diploid cell (2n) will undergo mitosis to produce two diploid (2n) daughter cells. During mitotic division, sister chromatids (replicated chromosomes) are involved in the division stages. i.e. diploid sister chromatids align at the equator of the cell during Metaphase and also sister chromatids are separated or pulled apart to opposite poles during Anaphase.

Meiosis, on the other hand, is a kind of cell division that results in daughter cells with a reduced number of chromosome (by half). Since the chromosome number is reduced, meiosis occurs in a two step division process viz: Meiosis I and II.

Meiosis I produces two genetically different daughter cells. The daughter cells have a reduced number of chromosomes i.e. from diploid (2n) to haploid (n). Meiosis I involves homologous chromosomes (similar but non-identical chromosomes received from each parent) which pair up to form a TETRAD structure in the Prophase stage. This structure allows for an exchange of chromosomal segment between non-sister chromatids of homologous chromosomes, a process called CROSSING-OVER. Crossing-over is what makes the daughter cells genetically different from the parent cell. Homologous chromosomes also aligns at the equator of the cell during Metaphase and later separates during Anaphase.

Meiosis II divides the two daughter cells produced in meiosis I into four genetically different daughter cells. Since the chromosome number has been reduced from diploid (2n) to haploid (n) in meiosis I when homologous chromosomes separate, haploid sister chromatids are involved in the stages of meiosis II i.e. haploid sister chromatids align at the equator of the cell during Metaphase and eventually becomes pulled apart during Anaphase.

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