Homozygotes exhibit w- eye phenotype. l(2)40Fg, l(2)40Ff and l(2)40Fe have reduced activity relative to the parental chromosome due to position effects. Heterozygotes with lt- have low viability, adult escapers exhibit a mutant lt phenotype. Heterozygotes with l(2)40Fa2 exhibit a rough eye phenotype.
Class IV derivatives of T(2;3)ltX13, P{wF} chromosome can be ordered from the smallest deficiency to the largest: T(2;3)tx-p18 = T(2;3)tx-p31 < T(2;3)tx-p1 < T(2;3)tx-p19 < T(2;3)lt-x13p89 < T(2;3)lt-x13p20 < T(2;3)tx-p5 < T(2;3)tx-p15.
Second chromosome heterochromatin bands h37 and h36 have been deleted, the breakpoint may map within or near h35. Internal deletion within the P{wF} element (at position 97B), deletion of genomic sequences begins within 1.2kb of the 5' P{wF} end.