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AAaa AaBb AaBbCc AABBCCddEE anthers anthocyanin Antirrhinum apomixis back-crossing bags body-cell breed true breeder carry the gene cell cell-plasm chance chromo chromosome doubling chromosome number Chrysanthemum colchicine combinations Cr cR CR cropping cross cross-pollination desirable characters disc florets disease dominant dwarf emasculation equal numbers example female parent fertile flavone flower colour forms fruits garden dahlia germ-cells germinate give grow heredity Horticultural hybrid seed hybrid vigour important inflorescence insects John Innes kind of chromosome maize male parent male-sterile method normal number of chromosomes occur ovules pair of genes petals pigments pink pistils plant breeding plant carrying plant improvement plum pollen pollen parent pollen-grain pollen-tube polyploid possible produce progeny qualities raspberry ratio ray florets recessive recessive genes red-flowered resistance seedlings selection self-incompatible self-pollination selfing sets of chromosomes snapdragon species species-hybrid stamens sterile hybrid stigma strain Streptocarpus style sweet pea tomato true-breeding types usually varieties white-flowered yellow