Gene effects and variances in hybrid populations.

M O S T of the developments in quantitative genetic theory focus on the study of intrapopulation concepts. With an increasing consideration of more divergent genetic materials, a need for theory relating to hybrid populations exists. In this study two methods for characterizing the gene effects and genetic variability in interpopulation hybrids are compared. Also, covariances among relatives are compared for the two methods. The immediate interpopulation generated by crossing random individuals from two parent populations provides the reference base for defining the genetic parameters. Linkage equilibrium is assumed in each parent population so that gene distributions are uncorrelated in the reference populations. Effects of gems defined according to origin: The genotypic model for a hybrid individual as a function of uniting gametes is