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Table 3.

Non-disjunction at meiosis I in myt1 mutant females

Female genotypesRegular progenyRegular progenyDiplo-X progenyNullo-X progeny% of X-NDJ4^4% of 4-NDJTotal progeny
Cross 1 X/O XX^Y XX X^Y     
myt11/myt12 135 144 13 11.40 0.70 315 
myt11/TM3 459 340 0.10 801 
Cross 2 y+ females y males FM7,y,B/y females y+ males % of X-NDJ FM7,y,B/FM7,y,B or y/y females   
FM7,y,B/y;myt1/myt12 300 279 51 63 28.25  807 
FM7,y,B/y;myt11/TM3 347 360 1.39  717 
Female genotypesRegular progenyRegular progenyDiplo-X progenyNullo-X progeny% of X-NDJ4^4% of 4-NDJTotal progeny
Cross 1 X/O XX^Y XX X^Y     
myt11/myt12 135 144 13 11.40 0.70 315 
myt11/TM3 459 340 0.10 801 
Cross 2 y+ females y males FM7,y,B/y females y+ males % of X-NDJ FM7,y,B/FM7,y,B or y/y females   
FM7,y,B/y;myt1/myt12 300 279 51 63 28.25  807 
FM7,y,B/y;myt11/TM3 347 360 1.39  717 

The genetic crosses and calculations used to generate the data in this table are described in the Materials and methods. The percentage of NDJ is higher in cross 2 than in cross 1 because of the introduction of the FM7 balancer chromosome, which by itself increases the frequency of NDJ in both controls and in myt1 mutants.

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