- already existed in the population before methicillin was developed- were strongly selected for as methicillin became widely used to treat bacterial infections- Resistant varieties existed in the population but did not confer any advantage until the environment changed with the introduction of the drug methicillin.
  • Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection?
  • Which one of the following researchers developed a theory of evolution that was very similar to Charles Darwin's?
  • Varieties of Staphylococcus aureus that are resistant to the drug methicillin _____.
  • Which of the following is an example of the pattern of evolution? (Overview)
The proportion of mottled fish will increase over time.- The mottled fish will tend to escape predation because they are camouflaged against the mottled lake bottom. The mottled fish will most likely produce more offspring.
  • A group of small fish live in a lake with a uniformly light-brown sandy bottom. Most of the fish are light brown, but about 10% are mottled. This fish species is often prey for large birds that live on the shore. A construction company dumps a load of gravel in the bottom of the lake, giving it a mottled appearance. Which of these statements presents the most accurate prediction of what will happen to this fish population?
  • Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection?
  • Which of the following observations led to Darwin's major inferences?
  • From his observations of organisms in the Galapagos islands, Darwin reasoned that ___.
embryos of dissimilar organisms, such as sharks and humans, resemble each other- Early in development, the similarities among all vertebrate embryos are more apparent than the differences.
  • Which of the following is an example of the pattern of evolution? (Overview)
  • Varieties of Staphylococcus aureus that are resistant to the drug methicillin _____.
  • A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that _____.
  • Which one of the following researchers developed a theory of evolution that was very similar to Charles Darwin's?
- Members of a population vary in their heritable traits - Although organisms can produce huge numbers of offspring, many of these offspring do not survive. - both are important observations that led to Darwin's major inferences.
  • Which of the following observations led to Darwin's major inferences?
  • Which of the following is an example of the pattern of evolution? (Overview)
  • A group of small fish live in a lake with a uniformly light-brown sandy bottom. Most of the fish are light brown, but about 10% are mottled. This fish species is often prey for large birds that live on the shore. A construction company dumps a load of gravel in the bottom of the lake, giving it a mottled appearance. Which of these statements presents the most accurate prediction of what will happen to this fish population?
  • From his observations of organisms in the Galapagos islands, Darwin reasoned that ___.
A trait that gives an organism a reproductive advantage in the current environment.- Evolutionary adaptations are inherited characteristics that enhance an organism's ability to survive and reproduce in a particular environment.
  • Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection?
  • A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that _____.
  • Charles Darwin _____.
  • An adaption is _____.
- it is broad enough in scope to explain many observations- it is supported by a massive body of evidence from many disciplines- it is general enough to provide many testable hypotheses
  • Which one of the following researchers developed a theory of evolution that was very similar to Charles Darwin's?
  • Which of the following is an example of the pattern of evolution? (Overview)
  • The theory of evolution through natural selection is considered a scientific theory because _____.
  • A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that _____.
- A change occurs in the environment- Poorly adapated individuals have decreased survivorship- Well-adapted individuals leave more offspring than do poorly adapated individuals- Genetic frequencies within the population change
  • A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that _____.
  • Varieties of Staphylococcus aureus that are resistant to the drug methicillin _____.
  • Given a population that contains genetic variation, what is the correct sequence of the following events, under the influence of natural selection?
  • Which of the following is an example of the pattern of evolution? (Overview)
proposed natural selection as the mechanism of evolution- CorrectAlthough Wallace submitted his work for publication first, Darwin's work was known to have pre-dated Wallace's work and was much more detailed; therefore, Darwin was given credit for the theory.
  • An adaption is _____.
  • A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that _____.
  • Varieties of Staphylococcus aureus that are resistant to the drug methicillin _____.
  • Charles Darwin _____.
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