1Lt - 1B2 | 20F - 20A | 15D - 20A | 15D - 11F4 | 4E1 - 11F2 | 4D7 - 1B3 | 1Rt
Multiply inverted balancer of the X chromosome.
Heterozygosity for In(1)FM7 results in a complete, or near complete, suppression of exchange along the length of the X chromosome.
Males and homozygous females viable and fertile.
An excellent suppressor of recombination with normal-sequence X chromosomes. Commonly used in balancing, even in female fertile versions.