Multiple Choice
Evolutionary relationships between organisms are determined by:
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21. Evolution
Introduction to Evolution and Natural Selection
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In the context of introduction to evolution and natural selection, which statement best defines biological evolution?
A
Any behavioral change an individual makes in response to environmental stress
B
A change in allele frequencies in a population across generations
C
A population becoming perfectly adapted to its environment through intentional change
D
A gradual increase in the size of individual organisms within their lifetime
Verified step by step guidance1
Understand that biological evolution refers to changes that occur at the genetic level within populations over time, not changes within an individual organism's lifetime.
Recognize that evolution involves changes in allele frequencies, which are different versions of a gene, within a population across multiple generations.
Eliminate options that describe individual behavioral changes or intentional adaptations, as these do not represent genetic changes passed to offspring.
Focus on the concept that evolution is a population-level process, meaning it affects groups of organisms rather than single individuals.
Conclude that the best definition of biological evolution is 'a change in allele frequencies in a population across generations' because it captures the genetic and generational nature of evolution.
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