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Early Ideas on Inbreeding and Crossbreeding CONWAY ZIRKLE
Beginnings of the Heterosis Concept GEORGE HARRISON SHULL
Development of the Heterosis Concept H K HAYES
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abc abc abc acid alleles aminobenzoic acid antigenic auxotrophic mutants average backcross bottleneck breeders breeding Celaya cells cent centric region characters chromatids chromosome Corn Belt correlation crossbred cytoplasm deleterious diploid distribution dominance dominant genes double cross Drosophila dyads ears effects embryo endosperm epistasis equilibrium estimates evidence experiments factors favorable fertilization fruit gametes gene frequency gene pairs genetic genotype grain-row growth heritability heterocaryons heterosis heterotic heterozygote heterozygote advantage heterozygous homozygotes homozygous hybrid vigor inbred lines inbreeding increase indicated individual interaction involved knob linkage loci locus maize mating mean method monoploids mutant normal Northern Flints nuclei number of gene obtained overdominance parent Pearlneck phenotype physiological plants pollen population produced progeny races recessive reciprocal recombination recurrent selection seed segregation selfed single cross Southern Dents specific combining ability strains studies sulfonamide-requiring synthetic Table teosinte test crosses tester tion topcrosses values variance weight per locule yield