Файл:EB1911 Mendelism - tall and dwarf pea breeding results.jpg

English: Gregor Mendel's experiments with peas showed that the dwarfs always bred true, as did also one out of every three talls; the two remaining talls behaved as the original hybrids in giving three talls to one dwarf. Having regard to the characters, tallness and dwarfness, three and only three kinds of peas exist, viz. dwarfs which breed true, talls which breed true, and talls which give a fixed proportion of talls and dwarfs. The relation between these three forms may be briefly summarized in the scheme shown, in which pure tall and dwarf are represented by T and D respectively, while [T] denotes the talls which do not breed true.