Alejandro, a twin who was adopted by a family in Australia, and was given proper nutrition as he grew up. Alejandro's twin brother was not adopted, and continued to live in an orphanage. When comparing the height of the two boys, Alejandro is taller than his brother. What could be the reason for that?

Question

Quizplus · Accepted Answer

The height difference between the two twins is likely due to differences in their environments, specifically their nutrition. Alejandro was adopted by a family that gave him proper nutrition, so he was able to reach his full height potential. In contrast, his brother who remained in the orphanage likely did not receive the same level of nutrition, which could have stunted his growth. Phenotype refers to the physical expression of an individual's genes and environment, so this is the most appropriate choice. It is not related to Alejandro's allele (A), genotype (B), or heritability (D).

Alejandro, a Twin Who Was Adopted by a Family in Australia