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X₁X₁X₁X₂:X₁X₂Y mechanism of sex determination in Anastrepha bistrigata and A. serpentina (Diptera: Tephritidae)

Vera N. Solferini; Joao S. Morgante

Departamento de Biologia, Instituto de Biociências, Universidade de São Paulo, Caixa Postal 11461, 05499 São Paulo, SP. Send correspondence to J.S.M.

ABSTRACT

The most frequent situation in the genus Anastrepha is the diploid number 2n = 12 and the sex determination system is XX:XY. In A. bistrigata and A. serpentina we detected variation in the male diploid number due to an X₁X₁X₁X₂:X₁X₂Y system of sex determination. In this paper we discuss the probable origin of this sex determination mechanism in the karyotypes of A. bistrigata and A. serpentina.

Keywords: Sex determination; Anastrepha bistrigata; Serpentina; Tephritidae.

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