Effect of long duplications on the production of cya-8 progeny in crosses with easUCLA heterozygous or homozygous

ParentsaNontransparentTransparent% transparentb
easUCLA × eas+; Dp(OY329)12811
easUCLA; Dp(OY329) × easUCLA; Dp(OY329) (3)21100
easUCLA × eas+; Dp(S1229)11511
easUCLA; Dp(S1229) × easUCLA; Dp(S1229) (4)15700
  • a When the numbers were pooled for progeny from more than one cross, the number of crosses is given in parentheses. easUCLA; Dp(OY329) was obtained as a duplication progeny from T(VIRIIIR)OY329) × easUCLA, and Dp(S1229) was obtained as a duplication progeny from T(IVVIIL; IL;IIL; IVR)S1229 × easUCLA; see Perkins (1997).

  • b In the absence of Dp(OY329) or Dp(S1229), these crosses would be expected to produce ∼20% transparent progeny (see Table 1). Bhat and Kasbekar (2001) and Fehmer et al. (2001) suggest that these long duplications compete effectively for the RIP machinery, decreasing the frequency with which a small duplication in the same nucleus undergoes RIP.