Genic balance theory of sex determination was given by

The Genic balance theory of sex determination was given by Calvin Bridges. The theory states that the sex of a fruit fly is determined by the relative number of X chromosomes (X) and autosomal sets (A). Every individual whether male or female possesses genes for male and female characteristics. If there is an excess of female determining genes, a female develops. On the other hand, if the ratio of male determining genes is higher than the female determining genes, a male is formed.