TABLE 6

Hmr deletions partially suppress lethality of exceptional female hybrids

Regular female progeny (subset carrying marked-Y chromosome in parentheses, where scoreable)Viability of Xme1/Xme1/Ysib exceptional females, relative to Df/Xsib or In(1)AB/Xsib regular females (%)
Number Df/Xsib or In(1)AB/Xsib for reference [In(1)AB males in brackets]Exceptional progeny
Female parent (all D. me1)Male parentTemp.Relative viability +/Xsib (%)TotalNo. of Xme1/Xme1/Ysib femalesNo. of Xsib/Yme1 males
(A) In(1)ABD. mel. y w (control)25°89.0109 (52)206787471.6
[54 (21)](82)
D. mau. Iso 19718°103.164130288343.8
[46 (17)]
25°82.669126497471.0
[22 (5)]
29°102.73775154240.5
[6 (0)]
D. sim. ryi8318°98.8801594635.0
[9 (4)]
25°4.61091142801.8
[16 (0)]
29°045 [0]450580
(B) Df(1)N110D. mel. y v f; ry (control)25°76.359 (31)104118109200.0
(51)
D. mau. C164.118°aa57426873.7–147.4a
(31)
25°1376610648.2–96.4
(69)
29°2509021536.0–72.0
(108)
D. mau. Iso 19718°19214513675.5–151.0
(104)
25°22217217377.5–155.0
(106)
29°60444373.3–146.7
(31)
D. sim. v f218°81.0268 (106)485181826.7
(198)
25°81.0210 (97)3803120414.8
(178)
29°64.1103 (42)16981087.8
(83)
D. sim. ryi8318°aa5477819914.3–28.5a
(250)
25°23813133355.0–110.1
(150)
29°7631103.9–7.9
(39)
(C) Df(1)ras203D. mel. y w (control)25°78.7155 (66)27710212965.8
(109)
D. mau. w18°70.8120205b407233.3
25°119.278171b810010.3
29°90.020380140.0
D. mau. Iso 19718°105.91182434012633.9
25°105.869142326846.4
29°59.76299114017.7
D. sim. ryi8318°84.51683104332.4
25°9.4117128204617.1
29°0.090900530.0
D. sim. v f218°74.0771342212.6
25°96.0991941451.0
(D) Df(1)ras-v17D. mel. y w (control)25°120.9148327855457.4
D. mau. w18°66.26811335151.5
25°72.1437420446.5
29°116.76132033.3
D. mau. Iso 19718°70.020348340.0
25°130.2439912727.9
D. sim. ryi8318°82.798179909.2
25°61.190145535.6
  • Full genotypes of females (crossed to males of genotype indicated in column 2): (A) In(1)AB, y cv f mal/FM7c, y sc8 wa sn v g B/Dp(1;Y) y+; (B) Df(1)N110, w/FM4, y sc8 w f/Dp(1;Y) Bs; (C) Df(1)ras203, y v/FM7c, y sc8 wa sn v g B/Dp(1;Y) y+; (D) Df(1)ras-v17, sc8 v B/y v f/Dp(1;Y) y+ v+.

  • a Df(1)N110/Xsib and FM4/Xsib regular females could not be distinguished in these crosses. The lower limit of the relative viability calculations for exceptional females corresponds to the Df(1)N110/Xsib and FM4/Xsib classes being equally viable, while the upper limit corresponds to complete lethality of the FM4/Xsib> class.

  • b An additional 3 (18°) and 11 (25°) females of phenotype y+ w+ v+ B/B+ were observed. Most had rough and distorted eyes and some had malformed wings. These are likely to be Df(1)ras203/FM7c/Xmau; 2A metafemales. Xme1/Xme1/Xme1; 2me1/2sim, Lhr metafemale hybrids are also semiviable (Takamura and Watanabe 1980).