How Does Evolution Happen? Question Preview (ID: 47346)
6.2.
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Charles Darwin puzzled over differences in the _____ of the different species of Galapagos finches.
a) webbed feet
b) beaks
c) bone structure of wings
d) eye color
Darwin observed variations among individuals within a population, but he did not realize that these variations were caused by
a) interbreeding
b) differences in food
c) selective breeding
d) differences in genes
Which of the following factors is necessary for natural selection to occur in a species?
a) genetic variation within a population
b) an abundance of food resources
c) a hospitable environment
d) a strong family structure
Which of the following is an example of natural selection?
a) Bears moving into a new part of a forest over many generations
b) A tree growing toward sunlight
c) Shrubs growing longer thorns over many generations
d) A plant growing between rocks
Which was NOT a source of Charles Darwin’s ideas about evolution?
a) the writings of Thomas Malthus and Charles Lyell
b) Darwin’s observations of the Galápagos finches
c) the selective breeding practices of farmers and breeders
d) scientific discoveries about DNA and genetic changes
Populations of all species are limited by
a) genetic change, speciation, adaptation, and separation.
b) natural selection, evolution, and division.
c) starvation, disease, competition, and predation.
d) breeding, selection, sediment, and ancestry.
Modern scientific explanations of evolution
a) have replaced Darwin's theory
b) rely on genetics instead of natural selection
c) fail to explain how traits are inherited
d) combine the principles of natural selection and genetic inheritance
What is the process by which organisms that are better adapted to their environment survive and reproduce more successfully than less well adapted organisms do?
a) natural selection
b) genetic resistance
c) genetic change
d) species seperation
What evidence of natural selection is available today that was not available to Darwin?
a) organisms inherit traits
b) differences in genes create variation
c) humans can breed organisms for specific traits
d) there is great variation among organisms
A spider may produce hundreds of eggs, only a few of which may survive. This is an example of
a) overproduction.
b) speciation.
c) genetic change.
d) division.
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