Prometaphase I and anaphase I in an interchange heterozygote of Allium triquetrum (Liliaceae)

Four unstable malorientations in a chain quadrivalent, as well as maloriented bivalents, were studied in fixed prometaphase I pollen-mothercells from an interchange heterozygote of Allium triquetrum. The relative frequencies of these malorientations, in cells from pollen sacs of different developmental ages, suggest that maloriented bivalents, on the average, reorient before maloriented quadrivalents; and that, similarly, there are differences in the timing of reorientation amongst the four types of maloriented quadrivalents. — Further, the proportion of anaphase I cells derived from alternate orientation in the interchange quadrivalent is lower than expected in pollen sacs with a high percentage of cells in mid-anaphase; but higher than expected in pollen sacs in which relatively few cells have as yet proceeded into anaphase, and also in those in which most cells have already passed through anaphase. Arguably, these data are a direct outcome of the differential behavior of unstable maloriented quadrivalents in the preceeding prometaphase.     

Population genetics of red cell and serum markers in the four Albanian communities of Molise, Italy

In this paper phenotype and gene frequencies of ten genetic markers (AK, AP, EsD, 6-PGD, PGM1, PGM2, Hb, Alb, Cp and Hp) of the four Albanian communities (Campomarino, Montecilfone, Portocannone and Ururi) living in Molise are reported. The gene frequencies show a high variability. The heterogeneity analysis among these villages could demonstrate significant differences between Campomarino and Montecilfone and between Campomarino and Ururi. It is interesting to note that the demographic analysis has shown the highest rate of immigration and the lowest percentages of endogamy, Albanian surnames and Albanian-speaking individuals in Campomarino. Against that Montecilfone and Ururi are showing opposite values for the same parameters. The genetic data are also indicating some differences between these Albanian communities and the Italian population. A comparison with the present population of Albany is not possible because of the lack of data.