Answer:
The resistance that some bacterial populations develop to an antibiotic is an example of natural selection because the individuals with more resistance are those that survive, being an evidence of evolution since resistance can be inherited to the following generations.
Explanation:
The resistance to antibiotics that bacteria develop is the best example of how natural selection and evolution occurs, especially because of the fast and easy reproduction of these microorganisms.
In the example it can be seen that <u>only the the most resistant bacterial populations to the antibiotic survive over time</u>. Antibiotic resistance is due to mutations developed by bacteria that modify their structure and function so that they are not affected by an antimicrobial. According to natural selection, these mutations make resistance an inherited trait, and future generations will not be sensitive to the effect of the drug.
<u>Why does natural selection occur?</u> Only resistant individuals survive the effect of the antibiotic.
<u>How do you explain evolution?</u> Successive generations of bacteria have evolved, through mutations, to resist the effect of an antibiotic.
Answer:
<h2>Dihybrid cross involves crossing between two traits. Independent assortment is also explained using a dihybrid cross.</h2>
Explanation:
To obtain a phenotypic ration of 1:1:1:1 one of the parent must be heterozygous for both the trait and other parent must be homozygous recessive for both the trait.
If the long winged <em>Drosophila</em> with gray body is dominant then, it is represented by these genotype- LLGG, LlGG, LlGg and LLGg. Short and black <em>Drosophila</em> is considered as recessive (llgg)
Different crosses were carried to obtain a phenotypic ratio of 1:1:1:1.
So, if we cross LlGg with llgg we obtain a phenotypic ratio of 1:1:1:1
we obtain <em>Drosophila</em> which are
Long gray (4)
Long black (4)
Short gray (4)
Short black (4)
So, ratio comes out to be 1:1:1:1
C. It can be considered a global ecosystem
Answer: 1. Once an altered gene is placed on an organism it can not be reversed.
2. New organism created by genetic engineering could
present ecological problems.
Explanation:
Looking at the fact that genetic engineering employ the viral vector that carries the functional gene inside the human body system, the repercussion are still unknown. They may even replace an important gene in the human body which could be dangerous to human.