killmenowlolidontknowscience
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each of the black spaces below before clicking
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| What evidence did Charles Darwin collect in addition to specimens of organisms alive during his time? | Darwin collected many fossils.
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| Why might genetic drift occur if a small number of individuals colonize a new habitat? | A small group of individuals may carry alleles in different relative frequencies from those of the original
population.
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| Were Darwin’s hypotheses about natural selection and evolution similar to the ideas of most other scientists of his time? Explain. | No; Darwin’s hypotheses challenged the fundamental scientific ideas of the times.
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| What did observations of the tortoises of the Galápagos lead Charles Darwin to hypothesize about these animals’ ancestry? | Darwin hypothesized that they were descended from a single ancestral species.
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| What was the source of the oxygen gas that began to accumulate in the atmosphere more than 2 billion years ago? | The oxygen gas that was added to Earth’s atmosphere was produced by photosynthetic bacteria that lived in the
sea.
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| What information does relative dating provide? | Relative dating allows paleontologists to estimate a fossil’s age compared with that of other fossils.
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| Why is the fossil record an incomplete history of life? | The formation of a fossil depends on a precise combination of conditions, therefore many ancient organisms died
without leaving a trace.
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| Charles Darwin viewed the fossil record as | detailed record of evolution.
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| In genetic drift, allele frequencies change because of | chance
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| Primates have opposable vision, which is the ability to merge images from both eyes. | false
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| If an allele makes up one fourth of a population’s alleles for a given trait, its relative frequency is | 25%
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| Members of the genus Australopithecus used tools. | false
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| When a farmer breeds only his or her best livestock, the process involved is | artificial selection.
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| A single species that has evolved into several different forms that live in different ways has undergone | adaptive radiation.
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| In a population, the sum of the relative frequencies of all alleles for a particular trait is | equal to 100%
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| A factor that is necessary for the formation of a new species is | reproductive isolation
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| Genetic drift tends to occur in populations that | are small
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| The type of genetic drift that follows the colonization of a new habitat by a small group of individuals is called | the founder effect
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| In a population of finches in which one group of birds has a short, parrotlike beak and another group has a long, narrow beak, what process has probably occurred? | disruptive selection
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| When individuals with an average form of a trait have the highest fitness, the result is | stabilizing selection.
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| The allele frequencies of a population are more likely to remain unchanged if | all mating is random.
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| How would you date a sample of rock that you suspect as being one of the earliest on Earth? | Use a radioactive isotope with a long half-life.
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| Which of the following statements describe what all members of a population share? | They are members of the same species.
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| To compare the relative ages of fossils, scientists sometimes use an easily recognized species called a(an) | index fossil
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| Which statement is in agreement with Darwin’s theory of evolution? | More offspring are produced than can possibly survive.
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| Modern experiments similar to Miller and Urey’s demonstrate that simulating conditions thought to exist on early Earth can produce | some bases contained in RNA.
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| The number of possible phenotypes for a given trait depends on how many _ control the trait. | genes
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