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.
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ANSWER;- A population in which 90% of the people are vaccinated against the virus.
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- A scientist claims that pneumonia causes weight loss in mice. The table shows the weights (in grams) of six mice before infection and two days after infection. At alphaαequals=0.10, is there enough evidence to support the scientist's claim? Assume the samples are random and dependent, and the population is normally distributed. Complete parts (a) through (e) below. Mouse 1 2 3 4 5 6 Weight (before) 22.9 19.1 23.6 21.2 23.2 21.7 Weight (after) 21.4 18.3 22.9 20.9 22.1 20.8 (a) Identify the claim and state Upper H 0H0 and Upper H Subscript aHa. What is the claim? A. Pneumonia causes weight loss in mice. B. Pneumonia causes weight gain in mice. C. Weight loss causes pneumonia in mice. D. Weight gain causes pneumonia in mice. Let mu Subscript dμd be the hypothesized mean of the difference in the weights (beforeminus−after). What are Upper H 0H0 and Upper H Subscript…Which statistic below is the best example of incidence of a disease? A) In 2005, 2 million people died from HIV B) A total of 40 million people have died from HIV infection C) In 2005, 4 million people acquired HIV D) A total of 65 million people have gotten HIV E) 25 million people currently suffer from HIV infectionPlease help with the following: Alleles that increase resistance to disease are expected to increase in frequency in the population as a result of ______________. A. positive selection B. balancing selection C. negative selection D. artificial selection
- 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.In which population is evolution by natural selection most clearly demonstrated? Group of answer choices A virus sweeps through a population and makes everyone ill. A virus sweeps through a population and kills 10% of infants. It is not clear why some die and some don't. A virus sweeps through a population and kills 20% of the population. It is not clear why some die and some don't. A virus sweeps through a population and permanently sterilizes the 10% of the population that has allele hx25c.Polio has a basic reproduction number (R0) = 5. The vaccine is very good; in fact, the 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. Enter your answer to the nearest 4 decimal places (example: 0.2345)
- Vaccinating 65% of a population will provide herd immunity for a disease with which of the following reproductive rates? Pc= 1-(1/R0) Group of answer choices 2.2 Herd immunity will not be achieved for any of these reproductive rates. 4.5 3.1 5.0 Herd immunity will be achieved for all of these reproductive rates.Which is an example of disruptive selection? Group of answer choices Drug resistance increases with each generation; the resistant bacteria survive, and the nonresistant bacteria get killed off. Swiss starlings usually lay four or five eggs, thereby increasing their chances of more offspring. Over time, Equus developed strength, intelligence, speed and durable grinding teeth. Panay island snails mainly have two different phenotypes, black and white shells.Your friend remarks, "The giraffe stretched its neck while reaching for higher leaves; as a result, its offspring inherited longer necks” Which statement is the best response to correct your friend’s misconception? Group of answer choices Overproduction of offspring leads to a struggle for survival. Disuse of an organ may lead to its eventual disappearance. Characteristics acquired during an organism's life are generally not passed on through genes to its offspring. Only favorable adaptations have survival value.
- Your friend remarks, “The giraffe stretched its neck while reaching for higher leaves; as a result, its offspring inherited longer necks.” Which statement is the BEST response to correct your friend’s misconception? A. overproduction of offspring leads to a struggle for survival B. characteristics acquired during an organism’s life are generally not passed on through genes to its offspring C. only favorable adaptations have survival value and unfavorable adaptations are removed from the population D. disuse of an organ may lead to its eventual disappearanceSome antibiotics used to treat infections in humans are also used to treat chickens, but some groups oppose this practice. The overuse of antibiotics will most likely influence the natural selection of which type of organisms? a chickens that are resistant to infection b chickens that naturally make the antibiotics c microbes that are susceptible to the antibiotics d microbes that are resistant to the antibioticsPlease answer this question correctly: True or False: The traits of individuals who survive the longest spread through the population.