The growth rate and ovicidal activity of 10 complementary biauxotrophic mutants (haploid constitution) obtained from strain No 45 of the ovicidal fungus Penicillium lanosum was studied. The quantitative characters were further evaluated in 17 diploid strains prepared from pairs of mutants. By means of correspondence analysis "LINDA" was determined the share of parent haploid strains in the variability of diploids. This share is interpreted as the estimate of the genetic component. In the case of the growth rate the size of this component fluctuates from 70% to 90%; in the case of ovicidal activity it achieves the value of 75%.