GENETICAL, CYTOLOGICAL & BIOLOGICAL STUDIES OF OWSWF, CHRYSOMYA BEZZIANA EXPOSED TO GAMMA RAYS: VIII. KARYOTYPE OF FIELD & LABORATORY STRAINSI

Abstract

The karyotype of field & laboratory strains of OWSWF,Chrysomya bezziana was investigated. The results of this investigation showedthat this species has six pairs of chromosomes (2n = 12), which consist of fivepairs of autosomal chromosomes and a pair of sex chromosome. The averagelength of autosomal chromosomes of the field & laboratory strains were 4.03,3.77, 3.46, 3.05, 2.41, &4.00, 3.68, 3.38, 2.98, 2.53 mmfor chromosomes numbers2, 3, 4, 5& 6 respectively, while for the sex chromosome, it was difficult to bemeasured because they form what is like parachute shape. Furthermore, in thisinvestigation the arm & centromere indeces were also measured for field &laboratory strains. Lastly , the results of different mating between these twostrains of Ch. bezziana showed that they were belong to species Ch. bezziana.