Uploaded January 2026 | Updated September 2026, 2 weeks ago

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🌡️ Phenotypic Plasticity: When Environment Changes Your Traits

If your DNA is the "blueprint" for who you are, can the environment change the final building? In this video, we explore AP Biology Topic 5.5, focusing on phenotypic plasticity—the ability of one genotype to produce different phenotypes in response to different environmental conditions.

We tackle the mystery of our biology student’s inheritance: How could she be color blind if her parents aren't? While we look for the answer, we’ll examine how soil pH changes the color of Hydrangeas, how daylight hours flip the coat color of the snowshoe hare, and how temperature determines the sex of certain reptiles. We even dive into a fascinating case of identical twins where one is color blind and the other is not!

Perfect for students and teachers who want to understand why "nature vs. nurture" isn't a competition, but a complex interaction.

🎯 Learning Objectives:
-Explain how the same genotype can result in multiple phenotypes under different environmental conditions.

🧬 Nature Meets Nurture: Examples of Plasticity
1. Soil pH and Flower Color Hydrangeas act like living pH strips! The same plant can produce vastly different colors based purely on the chemistry of the soil it's planted in.
2. Photoperiod and the Snowshoe Hare As days get shorter, the snowshoe hare doesn't just get cold—it changes its entire look. This seasonal molting is triggered by light levels, not just temperature.
3. Temperature-Dependent Sex Determination In many reptiles, like crocodiles and turtles, the temperature of the nest during incubation determines whether the offspring will be male or female.

🔔 Like, subscribe, and comment below: How does non-Mendelian genetics help explain the traits people inherit? mrpauller.weebly.com/55-environmental-effects-on-phenotype.html

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Special thanks to our 🦀Decapoda level members whose support made this video possible.
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AI Disclosure: AI was used to create some of the imagery in our videos. We are learning as we go about the best ways to make use of this developing technology. AI was used to create video clips featuring the high school student in this video, it was not used to generate images or video demonstrating scientific concepts.