Modern HIV therapy

Each year a gardener saves seeds from those tomato plants th Show more Question 1 Select one answer. 10 points Each year a gardener saves seeds from those tomato plants that produce the juiciest fruits. She uses these seeds to plant the next years crop of 20 plants. Over time the gardener develops her own special variety of very juicy tomatoes. This is best described as an example of genetic drift mutation artificial selection sexual selection natural selection Question 2 Select one answer. 10 points What sorts of effects do new mutations have on the individuals that inherit them? Mutations disrupt the normal development of an organism. They produce phenotypes that are bizarre and have a poor chance of survival. Mutations can have a wide range of effects on proteins and therefore phenotypes. They may have no effect a negative effect or a positive effect on survival growth mating success etc. Mutations do not affect proteins or alter phenotypes; they only affect gene sequences (DNA). Question 3 Select one answer. 10 points Modern HIV therapy controls HIV infection through what strategy? Several different drugs are used that target different viral enzymes; if the virus evolves resistance to one drug a different set of drugs is used. A single very effective drug stops viral replication by targeting a key viral enzyme that is indispensable to the virus. A single drug that stops viral replication is paired with another drug that prevents the virus from mutating so that it cannot evolve resistance. Question 4 Select one answer. 10 points A storm uproots 60% of the trees in a population. This is an example of: Natural selection Genetic drift Gene flow Gene pool Question 5 Select one answer. 10 points A population of pond snails has two genetically determined types: one with a black stripe on its shell and one with a plain brown shell. Evidence indicates that there is absolutely no difference between the two snail types in terms of their fitness: each type survives grows and mates with the same average level of success. Over time black-striped snails become more or less common in a population due to chance events. At one point for example the pond nearly dries up and the few surviving snails happen to be mostly black-striped. This evolutionary change is the result of sexual selection genetic drift natural selection mutation gene flow Question 6 Select one answer. 10 points The sickle cell allele is more likely to have higher prevalence in populations where: Malaria is present Antibiotics are not available Antibiotics are available Malaria is not present Question 7 Select one answer. 10 points Humans are the only primate species in which mammary glands (breasts) remain large and prominent throughout adulthood. Other primates mammary glands swell only when they are nursing offspring; scientists are not sure why human females have noticeable breasts on a permanent basis. One hypothesis is that they increase a females ability to attract mates. If so this would be an example of a trait favored by genetic drift sexual selection gene flow natural selection artificial selection Question 8 Select one answer. 10 points ______________ can occur only if there are two or more separate gene pools that are exchanging individuals (through migration) or genes. natural selection genetic drift gene flow mutation Question 9 Select one answer. 10 points Which gene pool has changed through some process of microevolution? A mouse population (about 10000 mice total) starts with 99% of the mice tan and 1% white; after 20 years 70% are tan and 30% are white. A moth population increases from 3000 individuals to 33000 individuals over a period of favorable weather. Your cells express different genes today than they did when you were born. Show less


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