For the traits listed in the previous problem, which do ...

Question

For the traits listed in the previous problem, which do you think are likely to be multifactorial traits, with phenotypes that are influenced by genes and environment? Identify two environmental factors that might play a role in phenotypic variation of the traits you identified.

Accepted Answer

Hi, everyone. Let's take a look at this practice problem together. Which of the following is an example of phenotypes that are considered multifactorial traits. The answer options are a skin pigmentation. B heart disease, C cancer and D. All options are correct. So what is a multifactorial trait? It's when more than one factor causes a trait or a health condition. So option, a skin pigmentation that phenotype is affected not only by genes but also by sun exposure. Recall that sun exposure affects the amounts of melanin concentration in the skin and therefore affects pigmentation. So, skin pigmentation option A is a correct answer. Then we have option B heart disease, heart disease is a phenotype that is multifactorial, it's affected by genes, diet and lifestyle. So things like exercise. So B is also a correct answer. Then we have option C. Now we should recall that cancer can be caused by genetic mutations, but it is also affected by environmental mutagens. So things like U V, radiation, smoking chemicals and so C is also a correct answer. That means the correct answer is d that all options are correct. All right, everyone. I hope you found this helpful and I'll see you soon for the next practice problem.

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For the traits listed in the previous problem, which do you think are likely to be multifactorial traits, with phenotypes that are influenced by genes and environment? Identify two environmental factors that might play a role in phenotypic variation of the traits you identified.