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Karyotype polymorphism in Drosophila albomicans
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Supernumerary (B) chromosomes are present in Thai, Malay, and Burmese populations of Drosophila albomicans (2n = 6) in a polymorphic state. Although usually stable at mitosis, their numbers differed between individuals and their frequency was also different between isofemale lines and between populations. Arm 3 of the X3 chromosome was polymorphic for the presence and the size of a procentric heterochromatic segment. Chromosome 4 is polytypic for variation in length governed by differences in the amount of heterochromatin and the long variant is polymorphic for the location of its secondary constriction. Key words: Drosophila albomicans, karyotype polymorphism, B chromosome.
Title: Karyotype polymorphism in Drosophila albomicans
Description:
Supernumerary (B) chromosomes are present in Thai, Malay, and Burmese populations of Drosophila albomicans (2n = 6) in a polymorphic state.
Although usually stable at mitosis, their numbers differed between individuals and their frequency was also different between isofemale lines and between populations.
Arm 3 of the X3 chromosome was polymorphic for the presence and the size of a procentric heterochromatic segment.
Chromosome 4 is polytypic for variation in length governed by differences in the amount of heterochromatin and the long variant is polymorphic for the location of its secondary constriction.
Key words: Drosophila albomicans, karyotype polymorphism, B chromosome.
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