Karyotype of the bird blowfly, Protocalliphora falcozi Séguy, 1928 (Diptera, Calliphoridae).
The karyotype structure of Protocalliphora falcozi is described for the first time. The diploid complement comprises 2n = 12, n(male) = 5+XY. Male mitotic plates include four pairs of long (metacentric) and one pair of medium-sized (submetacentric) autosomes. The submetacentric sex chromosomes X and Y are the smallest elements of the set. An achiasmatic meiosis was determined. The heterochromosomes do not form a heterovalent because they occur separately during the first meiotic division. The examined karyotype shows a pericentromeric position of constitutive heterochromatin in all autosomes. The longer arm of the X chromosome is heterochromatic, while the Y is entirely euchromatic. The NORs are active at mitotic prophase and at early meiotic stages. Small, bright signals were observed in the centromeric regions of autosomes after DAPI staining.
Department of Zoology, Comenius University, Mlynská dolina B-1, 842-15 Bratislava, Slovakia. holecova@fns.uniba.sk
Milada
M
Holecová
Maria
M
Rozek
Anna
A
Maryańska-Nadachowska
Viera
V
Jánosková
D000818:Animals; D004175:Diptera / Q000235:genetics*; D005260:Female; D059785:Karyotype; D007621:Karyotyping / Q000379:methods; D008297:Male