Linkage data for j\2.<p>

Rick, C. M.<p>

The second jointless gene, j\2, derived from LA 166, the Galapagos
"pimpinellifolium" accession, was tested in a few linkage F2's in 1959.  The
following data summaries suggest a linkage with a\1.  The first family, for
which the Chi-square is not significant, suffers a significant shortage of
a\1.  For this reason the second family might be more dependable, Should this
linkage be confirmed, it would raise an interesting point about the presence
of both j\1, and j\2.  on the same chromosome.  In this light the allele test
between them should be repeated.  Through all these tests j\2 has continued to
manifest the peculiar phenotypic differences from those of j\1; i.e., elongate
pedicels, compound inflorescences, hypertrophied calyx and elongate fruit
shape.<p>

<pre>
                                           Adjusted
                                           contingency
Tester          + +   + t   j\2+   j\2 t   Chi-square   Co.

a\1      F2-R   116    17    44      1       3.044      25.5
a\1        "     83    39    41      5       6.639      31.0
ah         "    171    48    55     12
c          "    177    78    69     22
d\1        "    196    59    67     24
l\1        "    182    73    65     26
La         "     85   134    23     44
yv         "    173    46    50     17

</pre>
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