In an effort to identify the influence of genetic factors on both Type I diabetes and Type II diabetes, researchers calculated concordance rates for monozygotic twins. Concordance rates of 30-50% have been found for Type I diabetes and concordance rates of 80% for Type II. For both kinds of diabetes, dizygotic concordance rates were about 15%. What does this information suggest concerning the relative effect of genetic and environmental factors for each type of diabetes?

The provided question is incomplete as it lack the correct options to answer the question correctly however the correct options are as follows:

a) Environmental factors have no role in the occurrence of either type of diabetes.

b) Type II diabetes appears to be caused by a single, unidentified gene.

c) Genetic influences exert a larger role in Type II diabetes than in Type I diabetes.

d) Genetic factors have little or no role in the occurrence of Type I diabetes.

e) Type II diabetes is primarily determined by non-genetic factors.

Answer:

The correct answer option C.

Explanation:

Genetic factors influence the development of the type I and type II diabetes in monozygotic twins in the study by the concordance rates of 30 - 50% and 80%. In both type of diabetes the genetic influences also present but comparatively low in dizygotic.

In this study the role of genetic influences are mentioned directly where is no information about environmental influences are present. It also suggests that the influences in Type II is higher than the type II diabetes.

Thus, the correct answer is option C.