Genes, Environment, and Epigenetics
Genes do not act in isolation
Nature and nurture
A trait often depends on both genes and environment. Genes may set a range of possible outcomes, while environment helps determine where within that range a person ends up.
Environmental effects
Nutrition, temperature, stress, sunlight, and many other factors can influence how genes are expressed or how traits develop.
Epigenetics
Epigenetics refers to changes that affect gene activity without changing the DNA sequence itself. These changes can influence whether a gene is turned on or off.
Big idea
Having a gene does not always mean it will be used in the same way in every cell or environment.
Which best describes how many traits are determined?
Many traits result from interactions between genetic and environmental factors.
Correct answer: By both genes and environment
What is epigenetics?
Epigenetic changes influence how genes are used rather than altering the letters of DNA.
Correct answer: Changes in gene activity without changing DNA sequence
Which is an environmental factor that can affect traits?
Nutrition can strongly influence growth and development.
Correct answer: Nutrition
Why is it too simple to say genes alone decide every trait?
Traits are often the result of complex interactions, not just DNA sequence.
Correct answer: Because environment and gene regulation also matter