Some basic definitions on genetics in relation to bean cultivation are presented in which a description is given on how to use this information in a breeding program. Examples are given on the management of quantitative characters (yield and plant height) controlled by different genes and qualitative ones controlled by a single gene. Indeterminate growth habit is controlled by a dominant gene. Determinate plants are the result of a recessive homozygote gene. Seed coat shine is due to a dominant allele (Sh) and opacity, to 2 recessive alleles. One of the genes involved in the production of pigmentation in the seed coat seems to also intervene in the production of phaseollin, an effective substance against Rhizoctonia and root rots; therefore, white-seeded var. are susceptible to root rots. The hipersensitive reaction to BCMV is produced by a dominant gene. Genes resistant to beta and gamma races of anthracnose have been found in the same chromosome. The selection of qualitative characters that are controlled by many genes should begin with the earliest generation possible. (CIAT)
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