Natural Selection
Biology ⇒ Evolution and Diversity
Natural Selection starts at 8 and continues till grade 12.
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Describe how antibiotic resistance in bacteria is an example of natural selection.
Describe how sexual selection differs from natural selection.
Describe the difference between stabilizing, directional, and disruptive selection.
Describe the role of the environment in natural selection.
Explain how natural selection can lead to adaptation in a population over time.
Explain why genetic variation is important for natural selection.
Explain why natural selection does not always produce perfect organisms.
Explain why not all traits in a population are adaptive.
A population of fish lives in a lake with both clear and murky water areas. Over time, two distinct color morphs (light and dark) become more common, while intermediate colors decrease. What type of natural selection is most likely occurring, and why?
A population of insects is exposed to a new pesticide. After several generations, most of the population is resistant to the pesticide. Explain the process by which natural selection led to this outcome, including the role of genetic variation and differential survival.
A scientist observes that a certain allele increases in frequency in a population after a drought, because individuals with this allele are better able to conserve water. What is the selective pressure in this scenario?
Describe how frequency-dependent selection can maintain genetic diversity in a population, providing an example.
Explain how natural selection can lead to the evolution of complex structures, such as the vertebrate eye, despite the fact that intermediate forms may not be fully functional.
Explain why natural selection is considered a non-random process, even though it relies on random genetic variation.
