1. Besides already known three genes viz. Blown 1 (B
1), Blown 2(B
2) and blown 3(b
3), a new gene Blown 4(B
4) is found to be complementary to Blown 1 for the manifestation of a blown character.
2. Blown 4(B
4) and contracted (c
t) are linked with about 4 percent recombination. Two genes, dwarf 1(dw
1) and dwarf 2 (d
w2), are known for dwarf appearance, the one gene d
w1 having a linkage with cordate (c
0) and the another d
w2 with delicate (d
1). But, in addition to these genes, there is a new gene dwarf 3 (d
w3) which is linked to contracted with 39.9 percent recombination. Two dominant genes D
w1 and Dw
3 are complementary for the normal appearance.
4. As new members of contracted linkage group, two genes Blown 4 and dwarf 3 are added.
5. In this paper, five linkages are studied, giving the following recombination percent.
Blown 4 (B
4)-contracted (c
t)......about 4.0 percent
Blown 4 (B
4)-dwarf 3 (d
w3)......about 29.4 percent _??_......26.8 percent
contracted (c
t)-dwarf 3 (d
w3)......35.4 percent _??_......36.4 percent _??_......39.9 percent
dwarf 3 (d
w3)-side reduced (s
r)......25.0 percent
white flower (a
2-dwarf 3 (d
w3))......about 25.0 percent
6. The order of five genes on a chromosome may be arranged as follows: c
t-B
4-s
r-d
w3-a
2.
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