TABLE 3

Segregation data of the sex and the fourth chromosomes in X/Y males

Sperm classes
XY(Y)XY(Y)O% ND
Second or third
chromosome genotype
Na4(4)O4(4)O4(4)O4(4)OTotalMinutebSex
chromosome
Fourth
chromosome
+/+8719242190541020383819100.10.3
mei(2)ys91/mei(2)ys915125153751552081305136.968.0
mei(2)ys91/Df(2R)bw-S461408625962923980293778137.464.6
mei(2)yh92/mei(2)yh92911736691663662801042734428574617.58.7
mei(2)yh92/SM14013653147359013028684570.30.6
mei(3)M20/mei(3)M20575101175631472717543683220255539.247.4
mei(3)M20/DcxF215132446000309643270.30.4
mei(2)yoh7134/mei(2)yoh71341748315468197021010136202.86.9
mei(2)yoh7134/CyO1350804931000010024820.00.2
mei(2)yh149/mei(2)yh14974155811144140039030536061.21.0
mei(2)yh149/SM11653304820002010171180.20.0
mei(2)yh217/mei(2)yh21722181331174170770307511082.50.3
mei(2)yh217/SM12713021118931040250010430.20.3
mei(2)yh15/mei(2)yh155421392018221400151399622550.41.8
mei(2)yh15/SM12212920128310070258310210.30.1
mei(2)yh137/mei(2)yh1378321084621835440110440612910.34.6
mei(2)yh137/SM140988510352104020354860.20.7
mei(2)yh137/tefZ5549 c29112238112037201023206350.16.7
tefZ5549/tefZ554924794179789190102119565700.246.7
  • y/y+Y; spa+/spa+ males were single-pair mated to y/y; C(4)RM, spapol/O females. SM1, CyO, and DcxF are balancers. Data presented are based on the number of Minute+ progeny (see materials and methods). The possible presence of multiple doses of the indicated chromosomes that cannot be distinguished phenotypically is shown in parentheses in the sperm genotypes. ND, nondisjunction.

  • a Number of single-pair matings performed.

  • b All haplo-4 Minutes were listed here without classification and were excluded from further analysis and from the calculation of nondisjunction frequencies.

  • c y/y+Y; spapol/spa+ males were single-pair mated to y/y; C(4)RM, ci eyR/O females. mei(2)ys91 turned out to be an allele of ord, and mei(2)yh137 turned out to be an allele of tef (see text).