Addiction and obesity are two of the options listed on the student resource sheet. Addiction can be caused by the environment having access to highly addictive things like drugs, ipads, and video games. If a parent alters the "gene" for addiction, their child could still get addicted to drugs or electronics if they enjoy using it too much. Obesity can also be caused by the environment. Parents could change the genes for obesity, but that doesn't mean if their child sits for hours on end watching TV or playing video games while eating fattening foods, they will still stay skinny.
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