THE CORRELATIVE VARIABILITY OF QUANTITATI VE AND QUALITATIVE CHARACTERS IN A MONOLOCUS DIALLELIC MODEL

The aim of the work was to analyse some regularities of correlative va riability of qualitative and quantitative characters. The simplest cla ssical model of quantitative character was used for study of the depen dence of mean (X) and variance (V) of quantitative character on the ge notypic composition of the group, on peculiarities of alleles relation s with quantitative character and on the allele frequencies (q). Two t ypes of the genotypic groups were discriminated: gomogeneous and heter ogeneous ones. In gomogeneous 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 th e group genotypic composition and also on the q. It is possible to det ermine the expected value of X and V for any group of known genotypic composition on the base of data calculated from direct measures of ind ividuals in the sample. The expected differences of variances in gomog eneous group of heterozygotes and heterogeneous ones of gomozygotes (1 /1+2/2) become significant sinse expected genotypic variance of last g roup is equal or more than 0.4V(E), where V(E)- nongenotypic variance. The need of taking into consideration expected X and V under comparin g quantitative character in groups with different genotypic compositio ns is discussed.