Abstract
Under first offspring parent mating, the number of generations of inbreeding required to reach homozygosity at all loci, as calculated from the theory of junctions, is considerably larger than under alternate parent offspring mating. For animals with one offspring at a birth and a short time between generations, first offspring parent mating is the more rapid in terms of time rather than generations. Heterogenic tracts attached to segregating dominants are reduced slightly more rapidly under first offspring parent mating than under sib-mating. Previous results on junctions in sib-mating obtained by approximate methods are confirmed by an algebraically exact analysis.

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