Shane and Blane are identical (monozygotic) twins; however, people seldom get the two brothers mixed up because Blane is almost two 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

Lance Raphael · Accepted Answer

Final Answer : C, Explanation :  The fact that Shane and Blane are identical suggests that they have the same genotype. However, the difference in height means that they display different phenotypes. This indicates that even though they have the same genotype, there are other factors affecting their height that result in different phenotypes. These factors could include environmental factors such as nutrition or hormone levels during development. Therefore, option C is correct.

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