Twin studies document similarities and differences between twins. when two twins raised under very circumstances display similar personality traits, that suggests a strong influence on personality. critics of twin studies suggest that some documented similarities between twins are based on the fact that the twins are still the same age and may have some because of it.

Twin studies document similarities and differences between twins. When two IDENTICAL twins raised under very DIFFERENT circumstances display similar personality traits, that suggests a strong GENETIC influence on personality. Critics of twin studies suggest that some documented similarities between twins are based on the fact that the twins are still the same age and may have some SIMILARITIES because of it.

Explanation:

It is not fully proved the genetic influence on the personality, and it is not the only factor wich modify the conduct.

It is stated that the personality is the result of a combination of different stimulus as genetic, socio-economic environment, parental education, upbringing rules, etc. Even the personal health can modify the personality.

b exhibiting favoritism toward the kikuyu people.

the answer is sex-linked recessive.