Index 



Allan, 80 



Alpatov, 86 



Anderson, vii, 2, 12, 31, 37, 39, 43, 48, 



86, 88, 91 

 Anderson and Hornback,vii, 93 

 Anderson and Hubricht, \di, 1, 12 

 Anderson and Ownbey, 82 

 Anderson and Schafer, 58 

 Anderson and Turrill, vii, 93 

 Anderson and Whitaker, 82 

 Antirrhinum, 58 

 Aquilegia, 19, 58 

 Asdepias, 61, 62, 64, 102 



Backcross, described, 23 



importance of studying, 62, 81 

 Baldwin and Schultes, 78 

 Beadle, 13 



Brown and Anderson, 91 

 Butterfly weed, see Asdepias 



Cain, 63 



Camp, 12, 65 



Carson and Stalker, 88 



Character association, as criteria for 

 hybridity, 43 



Character recombination, effect of 

 chromosomes upon, 35 



Chiasma frequency, relation to re- 

 combination, 42 



Chiasma locaUzation, relation to re- 

 combination, 42, 52 



Chromosomes, cohesive effects of, 36 

 effect upon character recombina- 

 tion, 35 



Cistus, 12, 66 



Cohesion, effect of Unkage on, 56 

 racial, 35 



Crataegus, 80, 89 



Cupressus X Chamaecyparis, 20 



Dansereau, 12, 66 



Desmarais, 66 



Domesticated plants, origin of, 67 



Drosophila, 100 



Epling, 62 



Erianthus, 20 



Erickson, 91 



Erigeron, 78 



Evolution of Helianthus under domes- 

 tication, 75 



Evolution under domestication, dia- 

 gram showing importance of 

 introgression in, 69 



Extrapolated correlates, method of, 93 

 advantages and disadvantages, 



99 

 example, 94 



Fi described, 23 



Fi habitat contrasted with that of F2, 



14 

 F2 habitat contrasted with that of Fi, 



14 

 F3, character recombination in, 49 

 Fagus, 65 

 Fassett, 88 



First h3'brid generation, see Fi 

 Focke, 22 

 Foster, 2 



Gartner, 21 



Genetics, of species crosses, graphical 

 summary, 72 



Habitat, Fi and F2 contrasted, 14 

 hybridization of, 15, 17, 18 

 restriction upon hybridization, 18 



Habitat preferences, inheritance of, 

 13 



107 



