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Ancient organisms that lived during closer time periods were more alike than organisms that lived in widely separated time periods. What evidence in the fossil record most directly supports this scientific claim?
genetic drift
He explained the mechanism that drives evolution.
the bottleneck effect
disruptive
the bottleneck effect
sexual selection
It has three arm bones and at least five finger bones.
Fossils found in adjacent rock layers are generally more like each other than fossils found in widely spaced layers.
When the allele frequencies of a population change because the size of the population has been reduced by disease or natural disaster, then ______________ has occurred.
genetic drift
He explained the mechanism that drives evolution.
the bottleneck effect
disruptive
the bottleneck effect
sexual selection
It has three arm bones and at least five finger bones.
Fossils found in adjacent rock layers are generally more like each other than fossils found in widely spaced layers.
Which of the following statements about Charles Darwin is true?
genetic drift
He explained the mechanism that drives evolution.
the bottleneck effect
disruptive
the bottleneck effect
sexual selection
It has three arm bones and at least five finger bones.
Fossils found in adjacent rock layers are generally more like each other than fossils found in widely spaced layers.
A new fossil is discovered and scientists conclude from comparative morphology that it is the forelimb of a vertebrate. What must the fossil look like?
genetic drift
He explained the mechanism that drives evolution.
the bottleneck effect
disruptive
the bottleneck effect
sexual selection
It has three arm bones and at least five finger bones.
Fossils found in adjacent rock layers are generally more like each other than fossils found in widely spaced layers.
Fossils show that ancestors of the giraffe had shorter necks than the modern giraffe. The evolution of the modern giraffe may be an example of
genetic drift
He explained the mechanism that drives evolution.
the bottleneck effect
disruptive
the bottleneck effect
sexual selection
It has three arm bones and at least five finger bones.
Fossils found in adjacent rock layers are generally more like each other than fossils found in widely spaced layers.
Extreme phenotypes are favored in ____________ selection.
genetic drift
He explained the mechanism that drives evolution.
the bottleneck effect
disruptive
the bottleneck effect
sexual selection
It has three arm bones and at least five finger bones.
Fossils found in adjacent rock layers are generally more like each other than fossils found in widely spaced layers.
A virus kills 99 percent of the members of a single species in an isolated region. The few remaining individuals reproduce and begin to repopulate the region. This is an example of
genetic drift
He explained the mechanism that drives evolution.
the bottleneck effect
disruptive
the bottleneck effect
sexual selection
It has three arm bones and at least five finger bones.
Fossils found in adjacent rock layers are generally more like each other than fossils found in widely spaced layers.
Stabilizing selection helps counteract the effects of
genetic drift
He explained the mechanism that drives evolution.
the bottleneck effect
disruptive
the bottleneck effect
sexual selection
It has three arm bones and at least five finger bones.
Fossils found in adjacent rock layers are generally more like each other than fossils found in widely spaced layers.
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