G 11 - 20.2 Evolutionary Patterns & Processes

What are major transformations in anatomy, phylogeny, ecology, and behavior that usually occur in larger clades called?

• Extinction events

• Speciation events

• Macroevolutionary patterns

• Microevolutionary patterns

What does the fossil evidence suggest about the rate of evolution?

• Evolution is a linear process that does not vary

• All species evolve gradually without sudden changes

• Evolution can occur at different rates in different clades and at different times

• Evolution occurs at a constant rate for all species

What is the "founder effect" in the context of genetic drift?

• The increase of traits in large populations

• The stabilizing of traits in a stable environment

• The extinction of species due to environmental changes

• The phenomenon where a small population colonizes a new environment, leading to rapid evolution

What do cladistic techniques primarily focus on when classifying fossils?

• The age of the fossils

• The physical appearance of fossils

• The geographical distribution of species

• The relationships among living species, extinct species, and common ancestors

What characterizes a mass extinction event?

• A small increase in background extinction

• The extinction of a large number of species over a relatively short time

• The adaptation of species to changing environments

• A gradual increase in species diversity

What is coevolution?

• The simultaneous evolution of two or more species in response to changes in each other

• The process where species become extinct due to environmental changes

• The gradual adaptation of a species to its environment

• The diversification of species into different niches

What is the relationship between speciation and extinction rates in a clade?

• If speciation rates are equal to or greater than extinction rates, the clade will continue to exist

• Higher extinction rates lead to increased speciation

• Clades with low diversity are more likely to survive

• Speciation has no impact on the survival of a clade

What is "adaptive radiation"?

• The extinction of species due to environmental changes

• The gradual change of species over time

• The process where a single ancestral species evolves into several distinct species to adapt to different niches

• The stabilization of traits within a species

What concept did Darwin suggest regarding the pace of evolution?

• Stasis

• Gradualism

• Catastrophism

• Punctuated equilibrium

What does the term "punctuated equilibrium" refer to in evolutionary biology?

• Brief periods of rapid change interrupting long periods of stability

• The extinction of species at a constant rate

• Constant gradual change over time

• Continuous evolution without any stasis