caa a22 4500 477090044 CHVBK 20180405111514.0 cr unu---uuuuu 170330e19960801xx s 000 0 eng 10.1007/BF02257270 doi (NATIONALLICENCE)springer-10.1007/BF02257270 Meiotic behavior of the X1X2Y1Y2 quadrivalent of the primate Alouatta caraya [Elektronische Daten] [M. Rahn, M. Mudry, M. Merani, A. Solari] A multiple sex chromosome system was found in three unrelated individuals of the primateAlouatta caraya. This mechanism is originated by a translocation between the Y chromosome and one of the autosomes (A7). Mitotic karyotypes show two small, acrocentric chromosomes (AY and YA), which are the translocation products. In metaphase I of male meiosis, there is a very long chain quadrivalent in which the order of the element is: X−YA−A7−AY. Segregation in the quadrivalent is alternate and gives balanced products. Synaptonemal complex karyotypes at pachytene show the structure of the quadrivalent made by the four axes. There is a slight difference in the relative length of AY and YA and the kinetochore of A7 aligns with that of AY. The synaptic pattern and changes in the quadrivalent during pachytene are described. Thin sections of the quadrivalent body show that the chromatin packing in the sex chromosome region is different from that of the autosomal region. This X1X2Y1Y2/X1X1XX2 sex chromosome system may be extended among other members of the genusAlouatta. Rapid Science Publishers, 1996 Alouatta caraya nationallicence multiple sex chromosomes nationallicence quadrivalent analysis nationallicence synaptonemal complex nationallicence Rahn M. Centro de Investigaciones en Reproduccion-Facultad de Medicina, (1121), Buenos Aires, Argentina aut Mudry M. Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, UBA, GIBE, (1428), Buenos Aires, Argentina aut Merani M. Centro de Investigaciones en Reproduccion-Facultad de Medicina, (1121), Buenos Aires, Argentina aut Solari A. Centro de Investigaciones en Reproduccion-Facultad de Medicina, (1121), Buenos Aires, Argentina aut Chromosome Research Kluwer Academic Publishers 4/5(1996-08-01), 350-356 0967-3849 4:5<350 1996 4 10577 https://doi.org/10.1007/BF02257270 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02257270 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rahn M. Centro de Investigaciones en Reproduccion-Facultad de Medicina, (1121), Buenos Aires, Argentina aut NATIONALLICENCE 700 1- Mudry M. Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, UBA, GIBE, (1428), Buenos Aires, Argentina aut NATIONALLICENCE 700 1- Merani M. Centro de Investigaciones en Reproduccion-Facultad de Medicina, (1121), Buenos Aires, Argentina aut NATIONALLICENCE 700 1- Solari A. Centro de Investigaciones en Reproduccion-Facultad de Medicina, (1121), Buenos Aires, Argentina aut NATIONALLICENCE 773 0- Chromosome Research Kluwer Academic Publishers 4/5(1996-08-01), 350-356 0967-3849 4:5<350 1996 4 10577 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer