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Answer:</em></h2>
<em>Given their unique regenerative abilities, stem cells offer new potentials for treating diseases such as diabetes, and heart disease. Research on stem cells continues to advance knowledge about how an organism develops from a single cell and how healthy cells replace damaged cells in adult organisms.</em>
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Her diagnosis is Turner's syndrome, this is an abnormality with the genes of the person and it is highly affecting only to women. This happens when the chromosome of a female has one complete X in each cell while the second is missing or incomplete.
Answer:
This question lacks options, options are: A) Vaccines for MRSA have become not effective because of changes to human immune systems. B) The presence of antibiotics induced the bacterial genomes to mutate and develop resistance to the drug. C) Decreased hospital sanitation practices to save money have resulted in increased presence of resistant staph infections. D) Selective pressures by excessive antibiotic use have increased the frequency of resistant strains of S. aureus over the last few decades.The correct answer is D.
Explanation:
The susceptibility of the various germs has varied greatly in recent years. Strains that had been consistently susceptible to all antimicrobial agents for decades have now developed resistance to these classic therapies, they have the ability to rapidly develop resistance to the newer antimicrobials. Methicillin Resistant Staphylococci (MRSA) is a clear example of this situation. The mechanism that confers resistance to methicillin is complex, since the bacterium has generated a genetic variation, which is encoded in the mecA gene, by which it modifies the structure of its penicillin-binding or binding protein (PBP2a), This prevents methicillin from adhering to the place where it is going to exert the action of blocking the transpeptidase enzyme (whose function in the bacterial life cycle is to synthesize the bacterial wall).Resistance to methicillin in strains of S. aureus is a growing problem worldwide, and staphylococcus gold is an agent that spreads easily and the behavior of the process is aggressive, with which this agent not only carries resistance to methicillin , but rather all ß-lactam antibiotics, including cephalosporins and carbapenem.
Answer:
True.
Explanation:
The Chargaff's rules indicate that in the DNA of all living organisms the amount of adenine (A) should be equal to the amount of thymine (T), while the amount of guanine (G) should be equal to the amount of cytosine (C). These rules were useful to describe the structure of the double helix and also enable to describe base patterns that often are associated with specific gene regions (for example, promoter regions are rich in AT). Moreover, an imbalance in the 1:1 equilibrium ratio is associated with mutations that may cause diseases such as cancer.
Answer:
3/8 tall, green, round
3/8 dwarf, green, round
Explanation:
<u>The progeny which are in highest ratio represent parental plants.</u>
Here in the given question, 3 out of 8 progeny are tall, green, round and 3 out of 8 progeny are dwarf, green, round which are the highest in number so they represent parental plants. The reason behind this is that during crossing over only two non-sister chromatids undergo crossing over while two other parental chromosomes remain intact. Out of the 4 chromosome types, 2 remain the same which will result in the same type of genotype of off-springs as of parents. So even if there is 100% chance of crossing over between non sister chromatids still only 50% will be recombinants rest of the 50% will represent parental type.
Another case may be when two genes are very near to each other then it is quite possible that the genes may not undergo crossing over at all in that case there will be no recombinants at all.
So, it simply means that parentals > recombinants or the progeny which are highest in number represent parentals.
In case of unlinked genes, parentals = recombinants. But, <u>recombinants can never be greater than parentals.</u>