Archive image from page 19 of Cytological and genetic studies of. Cytological and genetic studies of sterility in inbred and hybrid maize cytologicalgenet00clar Year: 1942 Connecticut E:i'penmerd Station BuUethi 465 plant was exaiuiiietl more completely and there were foimd a few fi<j- iires of heterozygous translocations. On eight preparations from dif- ferent anthers, a total of 642 chromosomes could be identified in 137 sporocytes. Of these, five sporocytes had a heterozygous transloca- tion between chromosomes 1 and '1 (Pigures 9. 14 and 15). and five sj)oi-ocytes had heteroZA'gous tr
Archive image from page 19 of Cytological and genetic studies of. Cytological and genetic studies of sterility in inbred and hybrid maize cytologicalgenet00clar Year: 1942 Connecticut E:i'penmerd Station BuUethi 465 plant was exaiuiiietl more completely and there were foimd a few fi<j- iires of heterozygous translocations. On eight preparations from dif- ferent anthers, a total of 642 chromosomes could be identified in 137 sporocytes. Of these, five sporocytes had a heterozygous transloca- tion between chromosomes 1 and '1 (Pigures 9. 14 and 15). and five sj)oi-ocytes had heteroZA'gous translocations that Avere not definitely identified, but were probably l)etween 4 and 5 and chromosomes 4 and 10. Figure 9. Hetfrozysous translocation be- tween chromosomes 1 and 1 I'onnd in a few sporocytes of an antlicr. A pliotograph of the sporocyte from which the drawinj; was made is shown in fijure 14. The translocation oc- curred near the knob on the long arm of chromosome 2 and about mid-way on the long arm of chromosome 1. IManl 3S-,v'2-l. rPedigree \), C'ytological cxaiiiiiialions were aUo made oi planls Ironi a cross between tlic ixior car and nonnal sib lines. No chromosomal changos \ver(W)bs('i\c(| in preparations Ifom four i)lan(s aUhough one of these had some nnn homologous association. ()ne sporocyte from prepar- ations from another |)lant liad a hetei-o/ygous transh)cation that was not completely ident ifieij. In preparations fi'om a sixth plant a trans- location iiiure w iis in one sporocyte at diakinesis and one fig- ure (d' ;i I Ti t rnnsloeation was observed at pachytene. Pollen from a plant in this progeny had \'-\ percent small and empty grains. 'I'liis is slightly more than the :'. to I percent aborted pollen i'onnd in normal plants.
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