Shane and Blane are identical (monozygotic)twins; however,people seldom get the two brothers mixed up because Blane is almost 2 inches shorter than Shane.The difference in height means that
A) even though both brothers display the same phenotype, they have different genotypes.
B) because the brothers display different phenotypes, they must also have different underlying genotypes.
C) even though both brothers share the same genotype, they display different phenotypes.
D) Blane is heterozygous for the "tallness" trait, and Shane is homozygous for the "tallness" trait.

Question

Quizplus · Accepted Answer

The fact that Shane and Blane are identical twins means that they have the same genotype. However, they display different phenotypes (height), which indicates that the environment has influenced their expression of the same genotype. Height is a complex trait that is influenced by both genetic and environmental factors. In this case, we can assume that Blane was exposed to different environmental factors that affected his growth and resulted in him being shorter than Shane. Therefore, the correct choice is C. Choices A, B, and D are not supported by the information given in the question.

Shane and Blane Are Identical (Monozygotic)twins; However,people Seldom Get the Two