3. Ms
20
. Backcross tests with the following chromosome alterations show no obvious linkage:
Inversion of chrom. 2 (near
B
and beyond
v
4
)
T2-4b (2 near
v
4
, 4 beyond
gl
3
)
T2-3c (2 near
sk
, 3 near
d
1
)
T4-8a (4 near
su
, 8 near spindle attachment)