. Colchicine in agriculture, medicine, biology, and chemistry. Colchicine; Colchicine. m Colchicine SPECIES A A, A, II SPECIES B B, B, X DIPLOID 2n DIPL0ID2n A, B DIPLOID HYBRID Jl CHROMOSOME DOUBLINGbyCOLCHICINEl I T f\i Ml Ml AI nil AUTOTETRAPLOID A, A, B, B, 4n A, A, II. AMPHIPLOID 4n T X B, B, B, B, AUTOTETRAPLOID 4n B, B, GAMETE 2n GAMETE 2n Fig. —Use of colchicine to make autotetraploids. Doubling the chromosomes of in- terspecific diploid hybrid. Amphiploids made by hybridizing two autotetraploid species. (After Wexelsen) kind of evolution was loinuilated as the A 'X B hypothe
. Colchicine in agriculture, medicine, biology, and chemistry. Colchicine; Colchicine. m Colchicine SPECIES A A, A, II SPECIES B B, B, X DIPLOID 2n DIPL0ID2n A, B DIPLOID HYBRID Jl CHROMOSOME DOUBLINGbyCOLCHICINEl I T f\i Ml Ml AI nil AUTOTETRAPLOID A, A, B, B, 4n A, A, II. AMPHIPLOID 4n T X B, B, B, B, AUTOTETRAPLOID 4n B, B, GAMETE 2n GAMETE 2n Fig. —Use of colchicine to make autotetraploids. Doubling the chromosomes of in- terspecific diploid hybrid. Amphiploids made by hybridizing two autotetraploid species. (After Wexelsen) kind of evolution was loinuilated as the A 'X B hypothesis by VVinge in 1917 before any examples were well known, although the doubling of Primula keivensis was on record.•'•' According to the A \ B hypothesis, a polyploid series with a basic number of 7 would read 21, 28, and 42; or triploid, tetraploid, and hexaploid, respec- tively. These can originate as follows: A triploid, sterile hybrid arises from the hybridization ])ctwcen the diploid, 2u =i 14, and a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Eigsti, O. J. (Orie Jacob), 1908-; Dustin, Pierre. Ames, Iowa State College Press
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