Final answer:
The maximum correlation coefficients for identical twins' behavioral and personality scores are approximately 0.70, indicating a strong genetic influence on these traits as per studies in behavioral genetics.
Step-by-step explanation:
The correlation coefficients for identical twins' scores on behavioral and personality measures are at most around 0.70. This relatively high correlation supports the concept of heritability in psychological traits, as studied in behavioral genetics. Particularly notable is the influence of genetic factors on personality traits, which has been backed by studies such as the Minnesota Study of Twins Reared Apart. The correlation coefficient is a statistical measure that reflects the degree of correlation between two variables, with 1 indicating a perfect positive correlation and -1 a perfect negative correlation. A correlation of 0.70 suggests a strong relationship.