🧪 Unit 1: Chemistry of Life
1.3Introduction to Biological Macromolecules
1.4Properties of Biological Macromolecules
1.5Structure and Function of Biological Macromolecules
🧬 Unit 2: Cell Structure and Function
2.1Cell Structure: Subcellular Components
🔋 Unit 3: Cellular Energetics
🦠 Unit 4: Cell Communication and Cell Cycle
4.0Unit 4 Overview: Cell Communication and Cell Cycle
4.2Introduction to Signal Transduction
👪 Unit 5: Heredity
👻 Unit 6: Gene Expression and Regulation
🦍 Unit 7: Natural Selection
🌲 Unit 8: Ecology
8.4Effect of Density of Populations
👏 General Review
✍️ Free Response Questions (FRQ)
Biology Long Essay Free Response Questions
Biology Short Essay Free Response Questions
🧐 Multiple Choice Questions (MCQ)
Biology Multiple Choice Questions
⏱️ 2 min read
June 11, 2020
Environmental conditions may play a role in which phenotypes are prevalent in a certain environment. This goes back to the concept of natural selection, in which environmental conditions can determine which individuals survive and reproduce more than others.
A classic example of environmental changes in phenotype is the coloration of certain mice species. In an environment that has been covered in permafrost for the past few thousand years, the majority of mice are light in color.
This allows these mice to easily blend in to the environment that they live in and, therefore, protects them from predators. They are more able to survive and reproduce, and their phenotype is dominant over the brown and black mice.
Image courtesy of Giphy.
Due to global warming, the layer of permafrost begins to melt, and the dark volcanic soil underneath begins to become more prevalent. If this were to occur, we would see a shift in the phenotypes of the mice.
Light mice would become more susceptible to predation, as they are easier to spot. Darker mice would have the advantage of being able to blend into the environment and would survive and reproduce more frequently.
Because of this, the phenotypes of the entire population would shift to become darker. The lighter mice would become less and less common, and the environment has changed the frequency of alleles in the population by creating an advantage for some phenotypes and not others.
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