A look at the population variability in the appearance of some human descriptive and personality traits in Bulgaria

. The phenotypic diversity relating to some descriptive human features in a complex with the basic personality traits, as well as the possible interactions between them were studied in a sample of 945 individuals. Using a self-reported questionnaire, data were collected about the following descriptive traits: hand dominance (left or right); hair on hand back; hairiness of the middle phalanges, bent little finger and thumb flexibility. The basic characteristics of personality – extraversion, agreeableness, conscientiousness, emotional stability and intellect/ imagination – were studied through the Goldberg's “Big-Five factor markers, International Personality Item Pool – IPIP” questionnaire, adapted to the Bulgarian population. The frequencies of the investigated phenotypic groups and statistic relations were calculated by usage of descriptive statistics and SPSS software. Statistically significant variations in the mean values of the personality factors were observed in relation to the descriptive traits studied, as follows: higher levels of conscientiousness and agreeableness in people with right hand dominance (p = 0.025 and 0.05, respectively) and higher levels of emotional stability in people with left hand dominance (p = 0.05); higher levels of emotional stability and lower levels of extraversion in people with hair on hand back (p = 0.012 and 0.06, respectively); higher levels of intellect/imagination in people with hairiness of the middle phalanges (p = 0.00); higher levels of conscientiousness and emotional stability in persons with a straight little finger (p = 0.004 and 0.05). The results of the investigation provide information on phenotypic variability regarding the studied descriptive and behavior characteristics, as well as on the established correlations between them. Future researches in this field would enrich the information concerning the polymorphism in the human populations and the characteristics of their phenotypic profile.