Open AccessChromosomal variation in Agromyzidae (Diptera)
Author(s) -
BLOCK KARIN
Publication year - 1975
Publication title -
hereditas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 50
eISSN - 1601-5223
pISSN - 0018-0661
DOI - 10.1111/j.1601-5223.1975.tb01520.x
Subject(s) - biology , polytene chromosome , chromosomal inversion , chromosomal polymorphism , chromosome , agromyzidae , genetics , chromosomal rearrangement , karyotype , metaphase , evolutionary biology , botany , gene , larva
Amauromyza (Trilobomyza) flavifrons (M eigen ) has a chromosome number of 2n = 6. In mitotic metaphase there are two metacentric and one subtelocentric pair. In polytene chromosomes there are 5 chromosome arms. Chromosome maps are presented. In 762 individuals from 11 localities polymorphism was found for 7 structural rearrangements: two simple paracentric inversions, two double inversions of the included type, one shift in close contact with a simple inversion, one asymmetric band and one asymmetric puff. No intermediate forms of the complex rearrangements were found. The rearrangements were distributed over 4 of the 5 chromosome arms. Within each locality all rearrangements were observed in equal frequencies on different occasions. Between localities, however, variation in frequencies occurred. 8 of the 11 localities contained equal frequencies of all rearrangements, but the remaining 3 localities showed deviations from the other 8 and they also differed from each other. No correlation between frequency of different rearrangements and ecology could be observed. Therefore, chromosomal polymorphism could be regarded as rigid rather than flexible but not in a typical form.