Abstract
Summary
The chromosome analysis of three continuous cell lines derived from mosquitos showed that A. aegypti (Singh) and A. albopictus lines had a complement formed by three pairs of metacentric chromosomes. Moreover, both lines exhibited chromatid discontinuities ranging from secondary constrictions to chromosome breakages with occcasional chromosomal rearrangements. These discontinuities were nonrandomly located and probably produced at a steady rate in every cell generation. On the other hand, the A. aegypti (Peleg) line had a complement formed by 7 chromosomes in all the metaphases analyzed. Chromosome morphology frequently varied from cell to cell and occasionally the homologue identification was difficult. The analysis of somatic pairing figures showed that the chromosome complement of this line is probably the result of chromosomal breakages and rearrangements involving different chromosomes.
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