Intraspecific polymorphism of sex chromosome heterochromatin in two species of the Anopheles gambiae complex |
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| Authors: | S Bonaccorsi G Santini M Gatti S Pimpinelli M Coluzzi |
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| Institution: | (1) Centro di Genetica Evoluzionistica del C.N.R., Istituto di Genetica, Universitá di Roma, Italy;(2) Istituto di Parassitologia, Università di Roma, Rome, Italy |
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| Abstract: | The Hoechst 33258 banding pattern of the mitotic chromosomes of several laboratory and natural populations of the sibling species A. gambiae and A. arabiensis has been analyzed. A clear intraspecific polymorphism of sex chromosome heterochromatin has been observed. Nevertheless in each species heterochromatic variations fall within a characteristic species-specific pattern. Moreover, while laboratory populations tend to be monomorphic for a given heterochromatic variant, natural populations exhibit a high degree of intrapopulation polymorphism. The possible role of sex chromosome heterochromatin in controlling fertility and mating behaviour of Anopheles mosquitoes is discussed. |
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