Yes inherited factors are really indispensable in determining the appearance of an individual, Athos assertion may be backed based on the fact that inherited factors forms a major part of an individual's DNA, which is used in the pronouncent of the child's parent. Using this view, an individual will most probably take after his/her parent in one or more physical ways. Hence, it is safe to say that this physical inherited factors which translates in an individual's appearance or look are central to and indispensable in identifying an individual's appearance.
