On the Interaction Between the Chromosomes Carrying the Detrimental Genes or Gene Blocks in Viability

This investigation was carried out to clarify whether or not the induced detrimental genes or gene blocks interact with each other, by means of using Drosophila as the material. It was ascertained that an interaction between genes or gene blocks for the viability in the 2nd and the 3rd chromosome exists. It was also demonstrated that the spectra of viability, that is, the distribution of frequencies in viability, formed bimodal curves for irradiated 2nd chromosomes, for irradiated 3rd chromosomes, and for both irradiated 2nd and 3rd chromosomes. The spectrum of viability in the isogenic lines is discussed with inference to these results. Further, the genetic load of an organism having two interacting loci is calculated, based on the theoretical model and based on the obtained results.