Nonhomologous pairing and nondisjunction of chromosomes of the first and second pairs in the oogenesis of Drosophila melanogaster XX females.
D000782:Aneuploidy; D000818:Animals; D002869:Chromosome Aberrations; D003433:Crosses, Genetic; D004331:Drosophila melanogaster; D005260:Female; D005838:Genotype; D006579:Heterozygote; D006720:Homozygote; D008297:Male; D008433:Mathematics; D009154:Mutation; D010063:Ovum / Q000378:metabolism*; D010641:Phenotype; D012730:Sex Chromosomes