Competition Between Strains With Autosomal and Standard Sex-determining Mechanisms in the Housefly (Muscidae)


Abstract: Experimental cages started with a mixture of flies at three different ratios (1:9, 5:5, 9:1) from populations having heterosomal and autosomal sex-determining mechanisms were cytogenetically examined over six generations at two different temperatures (25 °C and 35 °C). In general, there was an increase in the frequency of XX males in all competitive population cages. Abnormal testes and intersex appearance, frequent X chromosome aneuploidies and deviation from a 1:1 sex ratio were observed.

Keywords: Musca domestica L. Competition, cytogenetics, autosomal sex-determining mechanism, evolution.

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