[Observation on polytene chromosomes of the ovarian nurse cell of Anopheles minimus from Guangxi].

The ovarian nurse cell's polytene chromosomes of An. minimus exist as 5 arms, the telocentric X chromosome, the submetacentric chromosome 2 and the metacentric chromosome 3. The X chromosome is easily recognized by its length and shuttle-shaped zone 6. The most important characteristics is that each autosome arm has one to three big puffs. Among the 46 zones, 7A, B and 19C in 2R which is the longest arm in the complement, 28A and 20A, B in 2L, 30A, B and 37D in 3R and 46D and 38A, B in 3L are considered as characteristic zones. It is proposed that this map might be considered as the "standard" map of the ovarian nurse cell's polytene chromosomes for An. minimus from Guangxi.