b. Environmental factors can determine if a genetic trait becomes a health issue.
- Food, temperature, sunlight, and water are examples of environmental factors that can affect an organism's traits. Many characteristics of plants and animals involve both inheritance and the environment.
- Environmental factors such as diet, temperature, oxygen levels, humidity, light cycles, and the presence of mutagens can all impact which of an animal's genes are expressed, which ultimately affects the animal's phenotype.
- Changes in many genes, each with a small effect, may underlie susceptibility to many common diseases, including cancer, obesity, diabetes, heart disease, and mental illness.
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