Uploaded July 2026 | Updated September 2026, 2 weeks ago
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! khanacademy.org/science/grade-6-science-tx/x6eddf2e1c524bf5a:traits-and-the-environment/x6eddf2e1c524bf5a:trait-variation-and-environmental-change/v/trait-variation-and-environmental-change
Trait variation influences fitness by affecting how well organisms survive and reproduce in different environments. Whether inherited traits are advantageous or disadvantageous depends on the environment—and when the environment changes. As a result, how common or rare inherited traits are in a population can change over time.
Sections:
00:00 Intro
00:15 Reviewing traits
01:02 Advantageous and disadvantageous traits
02:28 Effects of environmental changes
03:48 Why trait variation is important
05:39 Summary
TEKS Standards: SCIENCE.6.13.C
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Donate or volunteer today! Donate here: khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Volunteer here: khanacademy.org/contribute?utm_source=youtube&utm_medium=desc
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! khanacademy.org/science/grade-6-science-tx/x6eddf2e1c524bf5a:traits-and-the-environment/x6eddf2e1c524bf5a:trait-variation-and-environmental-change/v/trait-variation-and-environmental-change
Trait variation influences fitness by affecting how well organisms survive and reproduce in different environments. Whether inherited traits are advantageous or disadvantageous depends on the environment—and when the environment changes. As a result, how common or rare inherited traits are in a population can change over time.
Sections:
00:00 Intro
00:15 Reviewing traits
01:02 Advantageous and disadvantageous traits
02:28 Effects of environmental changes
03:48 Why trait variation is important
05:39 Summary
TEKS Standards: SCIENCE.6.13.C
------------------
Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!
Donate or volunteer today! Donate here: khanacademy.org/donate?utm_source=youtube&utm_medium=desc
Volunteer here: khanacademy.org/contribute?utm_source=youtube&utm_medium=desc
