Types of Natural Selection Worksheet

📆 Updated: 1 Jan 1970
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Worksheets can be valuable tools for students who are learning about natural selection. By providing a structured format for analysis and critical thinking, worksheets allow students to engage with the subject matter in a systematic and organized manner. Whether you are a teacher seeking to reinforce key concepts or a student looking for additional practice, these types of natural selection worksheets can be an effective resource to enhance learning.



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  1. Evolution Worksheet Answer Key
  2. Natural Selection and Evolution Worksheet Answers
  3. Charles Darwin Theory of Natural Selection Finches
  4. Reproductive System Organs and Functions
  5. Consensus Decision-Making
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Charles Darwin Theory of Natural Selection Finches
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Reproductive System Organs and Functions
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Consensus Decision-Making
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What is directional selection?

Directional selection is a type of natural selection where a specific trait within a population becomes more or less common over time because individuals with the trait have a higher likelihood of survival and reproducing than those without it. This can lead to a shift in the average phenotype of a population towards one extreme of the trait spectrum.

How does stabilizing selection work?

Stabilizing selection works by favoring the intermediate phenotype in a population, while selecting against extreme phenotypes. This process helps maintain the status quo of a particular trait by reducing genetic variation for that trait over time. Essentially, stabilizing selection acts to preserve the current optimal phenotype by reducing the frequency of individuals with phenotypes that deviate from the mean, ultimately leading to a more consistent expression of the trait within a population.

What is disruptive selection?

Disruptive selection, also known as diversifying selection, is a type of natural selection that favors extreme phenotypes over intermediate phenotypes, resulting in the reduction of individuals with average traits. This process can lead to the divergence of a population into two distinct phenotypic groups, as both extreme phenotypes are better adapted to their specific environments compared to the intermediate phenotypes.

Describe sexual selection.

Sexual selection is a type of natural selection that occurs when individuals of a species compete for mates or choose mates based on specific traits. This leads to the evolution of characteristics that increase an individual's likelihood of mating and passing on their genes to the next generation. It can result in the development of exaggerated traits or behaviors that may not necessarily have a direct survival benefit but enhance an individual's success in attracting mates. Examples include elaborate displays, bright colors, or physical weapons used in mating competition.

Explain artificial selection.

Artificial selection is the process where humans intentionally breed plants or animals with desirable traits to promote those traits in future generations. By selectively choosing which individuals to mate based on specific characteristics, such as size, color, or behavior, humans can shape the genetic makeup of a population over time. This process has been used for thousands of years in agriculture and animal husbandry to create domesticated species with traits that are advantageous to humans.

What is genetic drift?

Genetic drift is a natural evolutionary process where changes in the frequencies of alleles (different forms of a gene) occur due to random chance events rather than natural selection. This phenomenon is more likely to have a significant impact on small populations, where chance events can have a greater influence on allele frequencies, leading to genetic diversity and potentially new adaptations over time.

Describe gene flow.

Gene flow is the movement of genes between populations of the same species, resulting from the movement of individuals or gametes. This process can introduce new genetic variation into a population, leading to increased genetic diversity, and can counteract the effects of genetic drift and natural selection. Gene flow plays a crucial role in maintaining genetic connectivity between populations and can prevent the divergence of isolated populations into separate species.

How does mutation impact natural selection?

Mutations introduce genetic variation within a population, which can be acted upon by natural selection. Natural selection favors individuals with advantageous mutations that increase their fitness, allowing them to survive and reproduce more successfully. Therefore, mutations play a crucial role in driving the process of evolution through natural selection by increasing the diversity of traits within a population and enabling species to adapt to changing environments over time.

Explain ecological selection.

Ecological selection, also known as environmental or ecological selective pressure, refers to the mechanism by which environmental factors influence the survival and reproductive success of individuals with specific traits. It plays a crucial role in driving evolutionary change by favoring traits that provide a fitness advantage in a particular ecological niche. Those individuals with traits that are better suited to their environment are more likely to survive, reproduce, and pass on those advantageous traits to their offspring, leading to the evolution of populations that are better adapted to their specific ecological conditions.

What is balancing selection?

Balancing selection is a type of natural selection that maintains genetic variation in a population by favoring the maintenance of different alleles of a gene. This occurs when different alleles confer advantages in different environments or circumstances, preventing any single allele from becoming fixed in the population. This results in a balanced equilibrium where multiple alleles are maintained at high frequencies over time.

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