Kerr, E.A.

New residents on Chromosome 1: rvt, vi, lg, pe, dp, Nr-2, tmf, cjf.

Early work (Butler TGC2:2) assigned pe-lg-vi to Chromosome 10. Later work with

trisomics (Khush and Rick TGC18:22—23) proved this erroneous. A more recent report by Reeves (TGC 22:21—22) puts a yg mutant near on Chromosome 10. This cannot be the originally obtained from P.A. Young by Butler. A previous report on tmf (Lukyanenko et al TGC23:24) did not indicate any close linkage with the genes tested. I am not aware of any linkage studies with cjf (Fehleisen TGC17:26-23),  dp (Yu and Yeager PASHS76:533-542) or rvt (Wyatt TGC21:40). Never ripe-2 (Nr-2) is a new mutant described elsewhere in this report. Accumulated data strongly suggest that all of these are on the long arm of Chromosome 1.

            Some of the data show marked deficiencies in some classes. I was not able to classify y in the presence of pe Classification of vi, tmf, and cjf was difficult. Many of the populations were small and the crossover distances did not always confirm the linear order. Unfortunately no data are available for most of the genes already placed on Chromosome 1. The gene order appears to be y-in-irr-imb-rvt-vi-lg-pe-dp-Nr-2-tmf-cjf. Three-point tests given in a separate note substantiate part of this order. The genes pe and rvt should simplify future mapping of Chromosome 1. They are fully fertile, viable and distinctive.