Several families of mostly South American rodents are included in the hystricomorphous rodents. The phenomenon of "karyotypic orthoselection" also shows that chromosomal changes are non-random. This ancestral karyotype for murid rodents was compared with that of a South American cricetid, Akodon arviculoides to test for similarities between the two subfamilies Viegas-Pequignot et al.
Horses are the only members of this order for which I have seen comparative G-banding studies. Two suborders are present, the Old World fruit bats and the rest of the bats. Kumamoto, K. Chromosomal evolution in African megachiroptera: G- and C-band assessment of the magnitude of change in similar standard karyotypes.
The many independently evolved vertebrate sex chromosome systems each raise the problem of dosage difference of X- or Z-borne genes between the sexes. Review concepts of species and their groupingsusing films, photos and team games. Expression profile of a degenerating neo-Y chromosome in Drosophila.
Schartl, M. This family currently consists of three well-recognized genera— Erythrinus Scopoli,Hoplias Gill,and Hoplerythrinus Gill, with at least 15 until now recognized species Oyakawa, ; Oyakawa and Mattox, Transitions between male and female heterogamety caused by sex-antagonistic selection.
However, birds have only incomplete sex chromosome dosage compensation 87raising questions about the generality of the lessons from the Drosophila neo-sex chromosomes and the eutherian X-added region, as well as reconstructing sex chromosome evolution games in West Midlands that the dichotomy between Drosophila and eutherians versus birds might not be heterogamety XY versus ZWbut rather complete versus incomplete dosage compensation.
YatesT. LawlorT. BunchT.
It is possible that chromosomal similarities have different explanations in different groups of animals. Featured Content An Everyday Miracle Few events in nature can rival the extraordinary life cycle of a butterfly. Bickham , J. Giemsa banding has made possible the identification of specific chromosomes involved in rearrangements Seabright , permitting one to determine whether similar species possess the same rearrangement.
Four hypotheses to explain similarities of chromosomal banding are discussed in this paper. Idiograms of 12 species and karyotype evolution in Herpestinae.