Zbornik - Društvo genetičara Srbije

II-Usm-2 ZBORNIK ABSTRAKATA III KONGRESA GENETIÈARA SRBIJE 49
Subotica, 30. novembar - 4. decembar 2004.
EFEKTI B HROMOZOMA KOD UTOGRLOG ŠUMSKOG MIŠA,
Apodemus flavicollis (Rodentia, Mammalia) – NIVO MORFOLOŠKE
INTEGRACIJE MANDIBULE
Vida Jojiæ 1 , Jelena Blagojeviæ 1 , Ana Ivanoviæ 2 i M. Vujoševiæ 1
1
Odeljenje za genetiku, Institut za biološka istraivanja «Siniša Stankoviæ», Beograd
2
Institut za zoologiju, Biološki fakultet, Beograd
B hromozomi (B) predstavljaju prekobrojne hromozome široko zastupljene kod mnogih
biljnih i ivotinjskih vrsta. U pogledu efekata ovih hromozoma na fenotipskom nivou
postoje velike razlike meðu vrstama kao i mali broj registrovanih sluèajeva gde prisustvo
Bs dovodi do kvalitativnih i/ili kvantitativnih promena fenotipa. Cilj rada bio je utvrðivanje
potencijalnih efekata B na morfološku varijabilnost mandibule kod jedinki populacije A.
flavicollis sa Avale. Korišæenjem fenotipskih korelacija meðu mandibularnim karakterima
procenjen je nivo morfološke integracije mandibule kod dve grupe jedinki (sa i bez B), kao
i kod 4 grupe jedinki (mujaci i enke sa i bez B). Mandibula glodara predstavlja
kompleksan skeletni organ sastavljen od dva funkcionalno i razvojno razlièita dela (corpus,
koji podupire korene zuba i ascending ramus, preko koga se mišiæi vezuju za donju vilicu).
Stepen morfološke integracije izraen preko indeksa integracije (I) procenjen je na tri nivoa
- corpus, ascending ramus i èitava mandibula. Sve tri vrednosti indeksa integracije bile su
veæe kod grupe jedinki sa B. Najizraenije poveæanje stepena morfološke integracije
registrovano je kod enki sa B. Dobijeni rezultati ukazuju ne samo da prisustvo B kod
utogrlog šumskog miša proizvodi efekte na nivou fenotipa, veæ i da je doprinos B
poveæanju nivoa morfološke integracije razlièit kod razlièitih polova.
THE EFFECTS OF B CHROMOSOMES IN YELLOW-NECKED MOUSE,
Apodemus flavicollis (Rodentia, Mammalia) - THE LEVEL OF
MORPHOLOGICAL INTEGRATION OF MANDIBLE
B chromosomes (Bs) are supernumerary chromosomes widely distributed among many
species of plants and animals. From the aspect of their phenotypic effects, species possessing
Bs are particularly diverse. In general, there is the scarcity of reported cases
where the presence of Bs influences phenotypes qualitatively and/or quantitatively. Our
goal was to search for the potential effects of Bs on morphological variation of mandible
in A. flavicollis from Avala population. We’ve choosed to study phenotypic correlations
among mandibular traits in order to estimate the level of their morphological integration
for both groups of animals (with and without Bs), as well as for divided sample according
to sex and presence of Bs (meles and females with and without Bs).. Bearing in mind that
rodent mandible is a complex skeletal organ consisting of two functional and developmental
units (corpus, supporting tooth roots and ascending ramus, participating in the attachments
of the muscles) we estimated morphological integration by index of integration
(I) on the three levels: overall mandible, corpus unit and ascending ramus unit. We
found that individuals with Bs showed higher level of morphological integration for both
units and for overall mandible as well. The highest increase in the level of morphological
integration showed females with Bs. These results indicate that presence of Bs not only
produces the effects in yellow-necked mouse, but also the contribution of Bs to increase
level of morphological integration is different in different sexes.