Answer:
The correct option is <em>B) Only triazine-resistant weeds survived and reproduced, so each year more pigweed was triazine-resistant.</em>
Explanation:
With time, the pigweed became resistant to triazine. As we know, according to the theory of natural selection only those species are able to survive and reproduce which are better adapted to live in an environment and adapt to the environmental changes. As the triazine- resistant weeds were better adapted survive and reproduce in the area, it began passing its resistant genes to offsprings. As a result, the population of the pigweed increases.
Answer:
Number of babies with dominant hemoglobin genotype will be 
Explanation:
Given -
% of babies have SCD which means they have recessive version of hemoglobin
Let the recessive version of hemoglobin be represented by "h" and normal version of hemoglobin be represented by "H"
Babies having SCD will have genotype "hh" i.e homozygous recessive.
As per Hardy Weinberg's equation -
Thus, frequency of allele for recessive version of hemoglobin (h) is
Frequency of allele for normal version of hemoglobin (H) is
Thus, Frequency of population with normal version of hemoglobin i.e HH is equal to
hence, number of babies with dominant hemoglobin genotype will be
<span>
the plant cell when placed under hypertonic medium,it loses a great amount of water and its cell membrane detaches from the cell wall.in this situation the cell is called plasmolysed cell.when the plasmolysed cell is placed in hypertonic medium it absorbs water and becomes a turgid cell.this phenomenon is called deplasmolysis.</span>
Ans.
Tuberculosis (TB) is a bacterial infection that affects mainly respiratory tract and can be transmitted from one to another person through contaminated air. The causative agent of tuberculosis, <em>Mycobacterium tuberculosis</em> has developed resistance against many antibiotics, such as rifampin and isoniazid, which is known as tuberculosis drug resistance.
If a person infected with TB shows drug resistance against some TB drugs, 'doctors should give other TB drugs to that person, even if these drugs show less effect than common drugs'. This is because these drugs can prevent or kill the bacterium more effectively than the common drugs for which, bacterium is resistance.
Answer:
the use of prokaryotes to clean up pollutants
Explanation:
Bioremediation, also called biological remediation, is a technique used to minimize the environmental impacts caused by pollution.
In this process biological degrading agents are used, particularly microorganisms (bacteria, fungi, yeast, enzymes, etc.), which detoxify areas contaminated by pollution. That is, we can say that bioremediation includes the use of prokaryotes to clean pollutants.
In bioremediation, prokaryotes remove or neutralize various toxic pollutants (organic and inorganic) from the environment, which are present in soils, waters (surface or underground), among others.
The microorganism used in the biological remediation process metabolizes and digests the contaminant. Consequently, it releases carbon dioxide (CO2) and water (H2O). A notorious example where bioremediation can be used is in the contamination (of soils or water resources) by petroleum and its derivatives.
