Sunlight exposure has stronger effet on skin cancer risk in fairskinned humans than in individuals with darker skin. this is an example of a) pleiotropy b) epistasis. c) genotype-by-environment interaction. d) differences in the norm of reaction. e) all of these choices are correct

The correct answer is  C) genotype-by-environment interaction.

Explanation:

Gene-environment interaction shows that how to different genotypes respond differently to the environmental variation. It tells us about how genetic and environmental factors are involved in influencing a disease in humans.

According to gene-environment interaction, every genotype responds differently to the environmental variations for example humans with genes that favor fair skin color have more chances to get skin cancer than the people who have the gene that code for darker skin color.

So by this example, we can say that different genotypes interact differently with the environment. So the right answer is C.

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