A diploid gecko lizard from Venezuela has a somatic chromosome number of 16. If the centromeres of the 8 homologous pairs are designated as aa, bb, cc, dd, ee, ff, gg, and hh, what is being referred to?
a) Chromosome morphology
b) Chromosome arrangement in meiosis
c) Allelic variations in chromosomes
d) Chromosome labeling in a karyotype