The linkage relations of ag.<p>

Rick, C.M.<p>

In TGC 5 I reported an indication of linkage between ag and H in contradiction
of Butler's results.  During 1955 segregations between these genes were tested
in coupling phase and also between ag and the u-t combination.  The following
two families of F2 ag-H coupling were tallied:<p>

<pre>
                          conting.
           a   b   c   d  X^2      c.o.
______________________________________________
ag - H   244  67  64  53  23.7     .35
         142  29  39  31  19.8     .32

</pre>
These figures agree fairly well with the mean of the two F2 repulsion values
that I reported last year, 32.5 and remove doubt concerning the linkage.<p>
     
Two families were grown of repulsion F2 tests in the ag vs t-u cross with the
following results:<p>

<pre>
ag - t  47  22  18  0  7.7
        86  32  23  0  8.1

ag - u  46  21  18  3  2.3
        91  31  16  7   .3
</pre>
     
It is therefore clear that ag lies in the vicinity of t in the region between
t and Xa.<p>

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