A new chromosomal sex-determining mechanism inMicrotus arvalis pallas |
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| Authors: | P. Raicu M. Kirillova M. Hamar |
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| Affiliation: | (1) Department of Genetics, University of Bucharest, Bucharest, Rumania;(2) Department for Rodents, Institute for Plant Protection, Bucharest, Rumania |
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| Abstract: | The karyotype in the rodentMicrotus arvalis comprises 21 autosome pairs and two heterosome pairs of the X1X2Y1Y2/X1X1X2X2 type. The occurrence of multiple sex chromosomes is thought to be due to a translocation of one arm of a metacentric autosome to the Y chromosome. This translocation would result in an additional acrocentric sex chromosome confined to the(heterogametic) male line, i.e., a Y2. The original metacentric chromosome thereby turns into an X2. Because of the translocation mentioned, a trivalent figure of the Y1Y2X2 type occurs in the first meiotic metaphase in the male. |
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