An extensive study was conducted on identical twins who were seperated at birth. Among other things, the study showed that the individual from each pair who received better nutrition during childhood tended to score higher on standardized intelligence tests. this can best be described as an example of how
a. mutation alter genotype
b. environment alters phenotype
c. environment alters genotype
d. mutation alters genotype
e. pleiotropic genes affect more than one trait
Answer: b. environment alters phenotype