2. Loci of chromosome-1 translocations. Further tests of the linkage relations of several chromosome-1 translocations have been made. The genes included in these tests are br f an and either gs or bm2.

These records indicate that T1-6a, T1-10a, T1-7b and T1-7c are to the left of br in the order given here with T1-6a relatively far from br and T1-7c relatively near it. T1-5a appears to be very near to and to the right of f, between it and an. T1-3d and T1-4 are between an and gs and relatively near an. Crossing over percentages between these several translocations and br, as reported here, are, for the most part, in close accord with those reported by Anderson (N. L. 1938, p. 6). Agreement is good also between the placements reported here and Anderson's cytological observations, except for T1-7c.

Five-point Translocation Tests
 
  T1-6a : + T1-10a : + T1-10a : + T1-7b : + T1-7b : +
  + : br + : br + : br + : br + : br
Region + : f + : f + : f + : f + : f
  + : an + : an + : an + : an + : an
  + : bm4 + : gs + : bm2 + : gs + : bm2

 

0 137 118 73 93 110
1 30 5 8 4 3
2 5 2 1 4  
3 34 14 18 3 7
4 101 55 52 17 59
1-2 1  
1-3 1 2 5 2  
1-4 17 5  
2-3 2 1 2  
2-4 6 1 10 1  
3-4 17 1 1 1  
1-2-3 1 2 1  
1-2-4   1  
1-3-4   1  
2-3-4  
1-2-3-4  
Total 352 207 171 126 179

 

Percent recombination
 
T-br 14.2   T-br 7.2   T-br 8.8   T-br 5.6   T-br 1.7
T-f 17.3   T-f 8.2   T-f 9.4   T-f 8.7   T-f 1.7
T-an 31.2   T-an 13.5   T-an 26.3   T-an 10.3   T-an 5.6
T-bm2 48.4   T-gs 38.2   T-bm2 47.4   T-gs 23.0   T-bm2 38.5
br-f 4.2   br-f 2.9   br-f 0.3   br-f 4.8   br-f 0
br-an 17.9   br-an 10.1   br-an 18.7   br-an 9.5   br-an 3.9
br-bm2 45.1   br-gs 37.7   br-bm2 44.5   br-gs 20.6   br-bm2 36.9
f-an 14.5   f-an 10.1   f-an 17.0   f-an 4.8   f-an 3.9
f-bm2 46.2   f-gs 38.7   f-bm2 46.2   f-gs 19.1   f-bm2 36.9
an-bm2 39.9   an-gs 30.4   an-bm2 40.8   an-gs 15.9   an-bm2 33.0

 

  T1-7c : + + : br + : br + : br + : br
  + : br + : f + : f + : f + : f
Region + : f T1-5a : + + : an + : an + : an
  + : an + : an T1-3d : + T1-3d : + T1-4 : +
  + : gs + : bm2 + : gs + : bm2 + : bm2

 

0 160 114 119 59 185
1 1 5 5 2  
2 9 6 4  
3 4   1   4
4 20 72 9 36 125
1-2 3  
1-3   1  
1-4 6 5 1 1 3
2-3   1   1
2-4 2 3 1 1 3
3-4 1 2 1 2 8
1-2-3 1  
1-2-4  
1-3-4  
2-3-4  
1-2-3-4  
Total 207 237 141 106 338

 

Percent recombination
 
T-br 2.9   br-f 8.8   br-f 4.2   br-f 2.8   br-f 2.4
T-f 6.3   br-T 9.4   br-an 7.8   br-an 8.5   br-an 3.6
T-an 12.6   br-an 26.3   br-T 9.2   br-T 9.4   br-T 7.7
T-gs 16.9   br-bm2 47.4   br-gs 13.4   br-bm2 40.6   br-bm2 40.5
br-f 6.3   f-T 0.3   f-an 3.5   f-an 5.7   f-an 2.4
br-an 1O.6   f-an 18.7   f-T 4.9   f-T 6.6   f-T 5.9
br-gs 17.9   f-bm2 44.5   f-gs 17.6   f-bm2 39.6   f-bm2 40.4
f-an 5.8   T-an 17.0   an-T 1.4   an-T 2.8   an-T 4.1
f-gs 14.5   T-bm2 46.2   an-gs 8.5   an-bm2 35.8   an-bm2 40.2
an-gs 15.0   an-bm2 40.8   T-gs 8.5   T-bm2 38.7   T-bm2 41.4