My presence in Europe last summer had, it turns out, a deleterious effect on my summer's work at Ithaca - a result not un-fore-seen. For such results as I am able to report, I am indebted to Dr. Lebedeff who did my work in addition to his own.
9. Tassel-seed 3 and tassel-seed 6. - In the News Letter of March 23, 1937 (p. 6), Lindstrom reported Ts6 as about 26 units from gs. At about that time I had found that Ts3 and an were closely linked. Since an and gs are about 27 units apart and since both Ts3 and Ts6 are dominant genes, it seemed possible that the two were alleles. Data obtained during the past summer though not wholly satisfactory indicate that Ts3 and Ts6 are not allelic. The data follow. (See also Lindstrom's report in this News Letter.)
|F1 genotype||0||1||2||1, 2||Total|
|+ Ts3 +||62-70||17-0||5-22||7-0|
|an + gs||132||17||27||7||183|
|+ + Ts6||58-37||16-6||13- 7||10-5|
|an gs +||95||22||20||15||152|
|+ Ts3 +||50 26||10-1||18-24||2-1|
|an + bm2||85||11||42||3||141|
|+ + Ts6||81-41||23-4||5- 0||0-0|
|an bm2 +||122||27||5||0||154|
If taken as they stand, these data indicate that Ts3 is between an and gs, while Ts6 is to the right of gs and probably to the right of bm2. It will be noted, however, that homologous recombination classes are far from equal. The first entry of the table shows a considerable deficiency of Ts3 plants and the second entry exhibits a similar deficiency of an plants. In the third and fourth entries, respectively, Ts3 and Ts6 are in excess of 50 percent, while an and bm2 are deficient. But such evidence as is available, if any, suggests that Ts3 is near an and Ts6 near bm2.