126 



THE CHROMOSOMES 



Diploid chromosome number, 



27 

 Diplotene, 55 

 Drosophila ajffinis, 101, 107 



ananassae, 107 



funebriSf 100 



melanogaster, 18, 32, 40, 70, 

 73, 80, 101 



miranda, 100, 103 



montium, 100, 104, 107 



jjseudo-obscura, 100, 101, 

 102 



repleta, 107 



simulans, 73, 101 



8ub-obscura, 101 



sulcata, 107 



virilia, 100, 107 

 Duplication, 97, 108 



Echinodermata, 42 



Elodea, 42 



Empetrurriy 42 



Evolution and chromosome 



numbers, 91, 105, 106 

 and origin of new species, 



99 

 and structural alterations 



in chromosomes, 89, 97, 



98 



Female heterogamety, 42 



Fixability, 8, 9 



Fragaria elatior, 42 



Fragmentation of chromo- 

 somes (in Ascaris), 29, 95 

 (by X-rays), 18 



Fritillaria, 71 



Frog, 5 



Fusion of chromosomes, 30, 

 94 



Oaleopsis Tetrahit, 92 

 Gene-mutations (nature of), 



89 

 Genie balance, 97 

 Gryllodea, 95 



Habrobracon, 44 

 Half-spindles, 16, 19 



Haploids, meiosis in, 81 

 Haploidy, male, 42 

 Heterogametic sex, 39 

 Heteropycnosis, 43 

 Homogametic sex, 39 

 Humulus, 42 

 Hybridization in genus 



Drosophila, 102 

 Hybrids, meiosis in, 73 

 Hymenoptera, 42 

 Hypericum punctatum, 84, 93 



Icerya purchasi, 9 

 Inert chromosomes, 34 

 Incipient species, 102, 105 

 Interference, 72 

 Intranuclear mitosis, 13 

 Inversions, 74 



Lacertilia, 96 



Lepidoptera, 42, 94 



Leptotene, 51 



Lethal deletions, 108 



Liliaceae, 51 



Lilium, 69 



Llaveia bouvari, 15 



Localization of chiasmata, 

 70 



Loss of parts of chromo- 

 somes, 108 



Lygaeus, 80 



Maize, 69, 71 



Mantis, 41, 81 



Marsupials, sex-chromosomes 



in, 80 

 Mecostethus, 70, 71 

 Melandrium, 42 

 Melanoplus femur-rubrum, 73 

 Metaphase, of mitosis, 14 

 of first meiotic division, 



63 

 of second meiotic division, 



67 

 Metrioptera, 9 

 Microchromosomes, 96 

 Micrmnalthus debilis, 42 

 Multipolar spindles, 19 

 Multivalents, 82 



