Sex Chromosomes in Lizards

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Science  24 Feb 1967:
Vol. 155, Issue 3765, pp. 1028-1029
DOI: 10.1126/science.155.3765.1028


Karyotypes of many species of the genus Sceloporus support the generalization that there are no morphologically recognizable sex chromosomes in lizards; however, there is a marked sexual dimorphism in the karyotypes of Sceloporus jarrovi and Sceloporus poinsetti. During meiosis in males, whose diploid number of chromosomes is 31, preferential segregation of chromosomes from a trivalent results in heterogamety.