The article "Why our flu vaccines can't keep up" mentions the concept of herd immunity. Look up what this is. Which of the following populations would be expected to exhibit herd immunity? O A population in which no one is vaccinated against the virus. O A population in which 25% of the people are vaccinated against the virus. A population in which 50% of the people are vaccinated against the virus. A population in which 90% of the people are vaccinated against the virus.

Why is it necessary for herd immunity to be high in a population?

Huntington’s Disease A population of people has a gene that determines whether they will developHuntington’s disease. The gene has two alleles, ”N” for normal allele and ”h” for the Huntington’s allele.According to the Hardy-Weinberg equilibrium, the frequency of the ”h” allele in the population is 0.005. Part AWhat is the frequency of the ”N” allele in the population?Part BWhat is the expected proportion of people in the population who are carriers of the Huntington’s disease?Part CWhat is the expected proportion of people in the population who are non-carriers of the Huntington’s disease?Part DWhat is the expected proportion of people in the population who will develop Huntington’s disease?

Polio has a basic reproduction number (R) = 5. The vaccine is very good; in fact, polio vaccine is 99% effective when two follow up booster shots are given. What proportion of a population needs to be vaccinated in order for herd immunity to be effective? Be sure to enter your answer as a decimal, not as a percentage.

In 2007, then–Texas governor Rick Perry became the first governor in the United States to mandate by executive order the vaccination of all Texas girls aged 11–12 for HPV, arguing that the vaccine prevented cancer. Some conservatives criticized Perry, arguing that the vaccine would encourage sexual promiscuity among children and young adults. The Texas legislature overturned the executive order, and Perry later reversed himself, saying the order was a mistake. Do you think states should require boys and girls to be vaccinated for HPV? Discuss reasons for and against such a requirement.

Imagine you were to collect data from simulation 2 (negative selective pressure on SS genotypes) over five generations. The frequency of the S allele over time is graphed below. The graph shows a rapid decrease in the sickle cell allele frequency in the first generation but a slower decrease in later generations. By the fifth generation, the allele is not completely eliminated from the population. Provide two plausible explanations for why the S allele persists after five generations.

How do the spleen sizes of the Bajau and the Saluan differ? Use data from the figure to support your response.

Explain why it is important to travel in a group?  explain three reasons why. explain each supporting point in 2-3 senetence with examples to clarify.

1. What is the equation that describes Ro for this model? 2.. Fill in the table below. In the first row of the table, state the formula used to calculate that particular column's variable. N y 3. B 800 0.5 500 0.2 0.001 0.2 0.001 200 0.003 500 0.1 0.005 250 0.4 Ro 2 3 0.6 1.25 Contracted Herd Immunity Threshold N/A If a person is infectious (contagious) for 2 days, what would the recovery rate be?