Cytological evidence of male heterogamety in sex determination of Telmatoscopus albipunctatus (Diptera: Psychodidae)

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Abstract
Telmatoscopus albipunctatus is polymorphic for several polytene chromosome bands. In examining the inheritance of a polymorphic heterochromatin-like band in chromosome IV we verified that it is inherited like a sex-linked factor. There are two types of chromosome IV in regard to this band: one bears a very thick heterochromatin-like band (H+), and the other bears a thinner corresponding band (H−). Three kinds of combinations are found in our stocks: H+H+, H+H− and H−H−. All three combinations can be found in females; however, in males, only the combinations H+H− and H−H− are found. Through specific crosses, it was concluded that the sex determining factor is located in chromosome IV in close vicinity to these bands.