The Order of the Genes C, Sh and Wx in Zea Mays with Reference to a Cytologically Known Point in the Chromosome

Abstract

Through trisomics, she has associated the linkage group involving C, sh, and wx to chromosome 9. Here she gives their order on the chromosome. She shows that they lie in the region between the interchange point described in McClintock 1930 and the terminal knob described in McClintock 1929. Does not definitively place them on the short arm, but suggests, with support from Stadler's evidence, that they lie there. Note: This paper was submitted with and immediately precedes the McClintock and Creighton crossing-over paper. It is important because it demonstrates that C, sh, and wx lie in the part of chr. 9 contributed in the interchange, and that therefore (and conversely) interchange chromosomes 9 contain those genes. It is clearly intended as a paper to lay the foundation for the second paper; it provides the second needed cytological landmark to establish crossing over. It concludes, "The author wishes to state that no attempt has been made to discuss in detail the data herein presented. It was desired to present briefly the evidence at this time, since it lends valuable support to the argument in the paper which follows."