In evolutionary biology, what type of natural selection favors one extreme version of a trait over others?
Answer
Directional selection
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In evolutionary biology, what type of natural selection favors one extreme version of a trait over others?
Answer
Directional selection
Which evolutionary theory proposes that most molecular changes are selectively neutral rather than strongly beneficial or harmful?
Answer
Neutral theory
What term describes evolution in which a single ancestral species gives rise to different forms in separate habitats?
Answer
Divergent evolution
Which fossil fish had lobed fins and is often used to illustrate the transition toward four-limbed vertebrates?
Answer
Tiktaalik
Which evolutionary force can make a rare allele become common purely through chance?
Answer
Genetic drift
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Which evolutionary force can make a rare allele become common purely through chance?
Answer
Genetic drift
What evolutionary process transfers DNA directly between unrelated organisms instead of from parent to offspring?
Answer
Horizontal gene transfer
What evolutionary process creates an extra copy of a gene that may later gain a new function?
Answer
Gene duplication
Which hominin species made the 3.66-million-year-old Laetoli footprints in Tanzania?
Answer
Australopithecus afarensis
Which 1942 book by Julian Huxley popularized the modern evolutionary synthesis linking natural selection with genetics?
Answer
Evolution: The Modern Synthesis
Which disease-causing organism became resistant to methicillin soon after the antibiotic was introduced in 1959?
Answer
Staphylococcus aureus