From rd120@XXXX Wed Feb 24 14:34:41 1999 To: gelbart@XXXX Subject: chromosome question Hi Bill, I am doing some work on the In(2L)dppd36 record - inspired by an update from John Roote. We currently have Dp(2;2)DTD48 as a segregant from Tp(2;2)DTD48. The record for Tp(2;2)DTD48 includes no mention of In(2L)dppd36. The record for In(2L)dppd36 includes no mention of Tp(2;2)DTD48. Your pc (FBrf0105410) mentions not In(2L)dppd36. The thing is that FBrf0098381 == The Moscow Regional Drosophila melanogaster Stock Center, Dubna, Russia, 1997, D. I. S. 80: 109--130 mentions (page 118 stock number 2049) a chromosome that is basically both In(2L)dppd36 and Dp(2;2)DTD48. This matches with what you sent to John 'In(2L)dppd36, Dp(2;2)DTD48/In(2LR)Gla ' (in terms of its aberrations). My question is, was the DTD48 duplication induced on the inversion, or vice versa? Many thanks, Rachel. From gelbart@XXXX Fri Feb 26 22:22:41 1999 To: rd120@XXXX Subject: Re: chromosome question Hi Rachel, The origin of Tp(2;2)DTD48 completely predates In(2L)dppd36. In(2L)dppd36 was induced on a genetic background of dpp+ Sp1 Bl1 Dp(2;2)DTD48 by Vivian Irish (her dissertation, 1986; Irish and Gelbart (Genes Dev. 1987 1:868--879 ). In(2L)dppd36 is a class V disk allele that is completely separable from the Dp(2;2)DTD48 by recombination. Bill
