[Correlative variability of quantitative and qualitative characters in a single-locus diallelic model]

The aim of the work was to analyse some regularities of correlative variability of qualitative and quantitative characters. The simplest classical model of quantitative character was used for study of the dependence of mean (X) and variance (V) of quantitative character on the genotypic composition of the group, on peculiarities of alleles relations with quantitative character and on the allele frequencies (q). Two types of the genotypic groups were discriminated: homogeneous and heterogeneous ones. In homogeneous groups V = 0; X and V are independent of the q. In heterogeneous ones V > 0 and both of X and V depend of the q. Specific contribution of additive and dominant allelic effect on the group genotypic composition and also on the q. It is possible to determine the expected value of X and V for any group of known genotypic composition on the base of data calculated from direct measures of individuals in the sample. The expected differences of variances in homogeneous group of heterozygotes and heterogeneous ones of homozygotes (1/1 + 2/2) become significant since expected genotypic variance of last group is equal or more than 0.4VE, where VE--nongenotypic variance. The need of taking into consideration expected X and V under comparing quantitative character in groups with different genotypic compositions is discussed.