. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. The male gonad of hybrid voles 3 ductive barriers. However, contrasting results emerge from other works. Solari & Ashley (1977) considered the absence of XY pairing and synaptonemal complex formation in the sand rat, Psammomys obesus, to be a consequence of heterochro- matin addition to both ends of the X chromosome. Male specimens of Nesokia indica with polymorphic X and Y chromosomes diffe- ring in amounts of heterocromatin, are sterile or exhibit reduced fert
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. The male gonad of hybrid voles 3 ductive barriers. However, contrasting results emerge from other works. Solari & Ashley (1977) considered the absence of XY pairing and synaptonemal complex formation in the sand rat, Psammomys obesus, to be a consequence of heterochro- matin addition to both ends of the X chromosome. Male specimens of Nesokia indica with polymorphic X and Y chromosomes diffe- ring in amounts of heterocromatin, are sterile or exhibit reduced fertility. Cryptic-. Figs 1—4: Seminífera tubules of Microtus savii ( Al; upper left), hybrid specimens from cros- ses between (M) M. savii and (F) M. brachycercus (A2 and A3; upper right and lower left) and from crosses between (M) M. brachycercus and (F) M. savii (A4; lower right).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zoologisches Forschungsinstitut und Museum Alexander Koenig. Bonn : Das Forschungsinstitut
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