Patterns of natural selection worksheet
- Patterns of natural selection worksheet
- Evidence of evolution:
- Evolution story in a minute: natural selection and adaptation
- Natural selection – crash course biology #14
- Natural selection animation (stabilizing, disruptive and
- Five fingers of evolution – paul andersen
- Natural selection
- Evolution: it’s a thing – crash course biology #20
Evidence of evolution:
Natural selection may take place in the presence or absence of environmental change. Selection in a specific direction Selection in a specific direction Directional Selection: This is a form of selection that eliminates individuals from one end of a phenotypic distribution, causing the distribution to change. Natural selection favors one extreme of constant variance over the other. The preferred extreme would become more common over time, while the other extreme will become less common or disappear.
Crabs will be less able to feed on thicker-shelled oysters if they are more resistant to breakage than thinner-shelled oysters, and thicker-shelled oysters will be more likely to live to reproduce.
Stabilizing Selection: A form of selection that eliminates individuals from both ends of a phenotypic distribution while holding the mean constant. occurs as natural selection prefers continuous variation’s intermediate states. The intermediate states become more common over time, while each extreme variance becomes less common or disappears. Using the oyster as an example, very light-colored or very dark-colored oysters may be preyed upon more frequently by shore birds simply because they are more noticeable on the oyster bar; as a result, intermediate hues become more prominent.
Evolution story in a minute: natural selection and adaptation
a simulation that looks at how this pattern evolved over several generations
Natural selection – crash course biology #14
Time limit: 5 minutes
Natural selection animation (stabilizing, disruptive and
Reproductive Advantage Simulation in Rock Pocket Mice (video)
Five fingers of evolution – paul andersen
This directed simulation brings together the principles of mutation and variation with the notion of how things evolve over time. Its aim is to raise the question, “How do organisms evolve over time?” The simulation contains the following features: Project the simulation to the entire class, following the steps in the Teacher Guide and addressing all of the talking points. Model Creation and/or Application This model simulates a variant trait’s reproductive rate under different conditions. Time: 25 minutes Advantage in Reproduction (interactive) Teacher’s Manual (pdf) What is Natural Selection, and how does it work? Natural Variety Recipe Natural selection and the three main ingredients by which it affects change over time are introduced in this video: a reproductive advantage over those who do not. Time limit: 5 minutes Natural Variety Recipe (video) Checklist for Natural Selection This checklist will serve as a framework for students to organize and compose a natural selection case in the classroom.
Natural selection will stabilize the population if it prefers an average phenotype by discriminating against extreme variation. Natural selection would benefit individuals who fit in better with the forest floor and are less likely to be detected by predators in a group of mice living in the woods, for example. Assuming the ground is a reasonably uniform shade of brown, mice with fur that is the most closely related to that color will most likely survive and reproduce, passing on their brown coat genes. Mice with alleles that make them slightly lighter or darker stand out against the ground and are more likely to be eaten by predators. The genetic variation of the population would decrease as a result of this stabilizing selection.
The evolution of the peppered moth in eighteenth- and nineteenth-century England is a perfect example of this form of selection. Prior to the Industrial Revolution, moths were often light in color, allowing them to blend in with nearby light-colored trees and lichens. When factories started to spew soot, the trees darkened, making light-colored moths easier to detect for predatory birds.
Evolution: it’s a thing – crash course biology #20
Any biology curriculum must have a solid understanding of evolution. Students can learn about evolution and natural selection through a combination of a lecture, worksheet, and multiple outdoor games and demonstrations in this lesson. The focus of these activities will be on how species evolve over time as a result of natural selection. Students will learn how to identify evolution and natural selection, as well as the essential elements that must be present for natural selection to take place. Students can also learn about the various types of selection through a series of demonstrations (directional, stabilizing, disruptive). Finally, both of these exercises can be used to recognise and explain the inaccuracies of many common myths about natural selection evolution.