while the chromosomes of different species belonging to the same group can usually be homologized almost completely , so that construction of intragroup phylogenies is easy , chromosomes of members of different groups are so modified structurally that in most cases only short sections can be fully homologized , and these in only one or two chromosome elements.-broadly homologous chromosome elements were compared for three species at a time , and on the basis of overlapping homologous sections , or overlapping inversions included within homologous sections , the trio of chromosomes , and the species to which they belonged can often be arranged in a two-step phylogenetic series .
C0729606
chromosome elements
C0008633
chromosomes