Metaphase karyotypes of Anopheles of Thailand and Southeast Asia: I. The Hyrcanus Group.
Metaphase karyotypes of 6 species of the Hyrcanus Species Group of the subgenus Anopheles show constitutive heterochromatin variation in X and Y chromosomes. Anopheles peditaeniatus exhibits the most extensive variation in the size and shape of heterochromatic sex chromosomes, with 3 types of X and 5 types of Y chromosomes. Anopheles nitidus shows the least variation, with only 2 types of X chromosomes. Anopheles sinensis and An. crawfordi each have 2 forms of metaphase karyotype in the heterochromatin of the Y chromosome. It is not known whether the 2 forms of metaphase karyotype in these 2 species represent inter- or intraspecific differences. The 2 forms of heterochromatic sex chromosomes observed in An. argyropus and An. nigerrimus may suggest the existence of sibling species complexes within each of these species.
Baimai
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Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand.
Rattanarithikul
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Kijchalao
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D000818:Animals; D000852:Anopheles / Q000235:genetics*; D001210:Asia, Southeastern; D005260:Female; D005828:Genetics, Population; D006570:Heterochromatin / Q000737:chemistry; D007621:Karyotyping; D008297:Male; D008677:Metaphase; D013045:Species Specificity; D013785:Thailand; D014960:X Chromosome / Q000737:chemistry; D014998:Y Chromosome / Q000737:chemistry
D006570:Heterochromatin