Abstract
Although they possess the nearly identical DNA value, placental mammals of today display an enormous array of karyotypes, with diploid chromosome numbers ranging from a high of 80 to a low of 17. This indicates that during extensive speciation from a common ancestor, autosomal linkage groups have undergone countless rearrangements. Yet, the original X-chromosome of a common ancestor has apparently been preserved in its entirety by a great majority of placental mammals of today, and in its multiplicated forms by a small number of exceptional species. This conservation of the original X as one unit clearly reveals that the type of X-autosome translocations which split the original X into two separate halves has always been severely deteriorative to speciation, and that these translocations were eliminated as they arose.
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Ohno, S. (1966). Three Different Consequences of X-autosome Translocation. In: Sex Chromosomes and Sex-linked Genes. Monographs on Endocrinology, vol 1Â . Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-35113-0_11
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DOI: https://doi.org/10.1007/978-3-662-35113-0_11
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