>From atc12@XXXX Thu Sep 11 22:49:48 1997 Envelope-to: ag24@XXXX Delivery-date: Thu, 11 Sep 1997 22:49:48 +0100 Date: Thu, 11 Sep 1997 22:55:40 +0100 (BST) From: Adelaide T C Carpenter <atc12@XXXX> To: Aubrey de Grey <ag24@XXXX> Subject: Official to FlyBase MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Content-Length: 1102 The mirr/cre/DH/B12/Sai/sai alleles on the D1 and D3 chromosomes are different as judged by viability of heterozygotes with Henry Sun's DH-1 allele (which is itself hypomorphic for the viability effect since it is homozygous viable, though with recessive outheld wings and reduced alulae, once the extraneous lethal(s) had been crossed off). D1 on CxD/DH is completely lethal; D1 on DcxF gives 4% escapers/DH (the two D1 chromosomes differ in extent of head defects -- DcxF in most genotypes has none, but they become dramatic over DH). D3/DH is, on the other hand, nearly completely viable (85-96% relative to the two balancer sib classes), with milder head defects (D3 itself has reverted that phene) but with missing bristles (not a dominant phene of D3, is a recessive phene of some other allele). Since D3 is still lethal over other alleles (eg, Sai1 and Sai2) it still carries a mutant allele of the 69D gene, but that allele is clearly different from the one carried on the parent D1 chromosome.