How do environmental factors influence genetic traits?
a. environmental factors determine all genetic traits.
b. environmental factors can determine if a genetic trait becomes a health issue.
c. environmental factors are determined by genetic traits.
d. environmental factors have no influence on genetic traits

b. Environmental factors can determine if a genetic trait becomes a health issue.

Explanation:

Traits are regulated by both genes and environmental conditions of the organisms. Specific environmental conditions determines health status of person. For example: An individual with non functional gene for melanin production may develop cancer upon exposure to lower dosage of sunlight. However, the other person with functional melanin gene has melanin pigment that serves as line of defense and requires higher dosages of UV exposure for cancer. Hence, environmental conditions regulate development of a genetic disease.

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

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