Dominant-Recessive Interaction and Their Probability on Human Phenotype

Ashraful Kabir

Department of Biology, Cantonment Public College, Saidpur Cantonment, Nilphamari, Bangladesh

Dr. Ashraful Kabir, Department of Biology, Cantonment Public College, Saidpur Cantonment, Nilphamari, Bangladesh.

Keywords: Dominant Character; Recessive Character; Inheritance; Phenotype

Abstract

In order to understand the genetic flow of the students which are responsible to their next progeny, this study has a great impact. A classroom was a good source for collecting these information regarding phenotypes. With few exceptions, the presence of common and visible dominant and recessive characteristics of male or female has been appreciated for the genetic study. This study aimed at determining the incidence of 34 characteristics (17 dominant - widow’s peak, black hair, curly hair, brown eye, long eyelash, normal vision, free earlobe, large nose, broad lips, rolling tongue, dimples present, cleft chin, hairs on fingers, right handedness, normal skin with melanin, rh positive, normal blood clotting and 17 recessive - straight hair line, light black hair, straight hair, blue eye, short eyelash, color blindness, attached earlobe, small nose, thin lips, cannot able to roll of the tongue, dimples absent, smooth chin, no hairs on fingers, left handedness, albino skin, rh negative, hemophilic) in a population of a Cantonment School of Bangladesh. 420 students (210 male and 210 female) were considered for observing the probability of dominant characters between male and female students by physical examination and questionnaires in their classes. Only in brown iris, normal vision, and normal skin with melanin had 100% dominant in both male and female students. The chi-square result showed that there were no significant differences between male and female students on their dominant characters. The incidence of above inherited traits of the individuals resulting from the genotypes inherited from their parents by Mendelian trait.

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