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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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addition advantage alleles amount antigenic appears assumed average basis breeding Celaya cells cent characters chromosome combining ability compared complete component considerable considered corn crosses cytoplasm Dents distribution dominance double early effects embryo endosperm estimates evidence example expected experiments fact factors families favorable four frequency fruit further gametes genes genetic genotype given greater growth heterosis heterozygous higher homozygous hybrid hybrid vigor important improvement inbred lines inbreeding increase indicated individual interaction involved less linkage loci maize mean method mutant natural normal observed obtained occur organisms original pairs parent performance period plants population possible present probably produced progeny races recessive recombination regions relatively respect seed seems selection selfed shown single specific strains studies substance Table teosinte tester tion topcrosses values variance varieties vigor weight per locule yield