Evolution of the X1X2Y sex chromosome mechanism in the scincid lizard Scincella laterale (Say)
Wright, J.W.
Chromosoma 43(1): 101-108
1973
ISSN/ISBN: 0009-5915 PMID: 4730562 Document Number: 5294
Most populations of Scincella laterale have 2N=30 chromosomes with XY sex chromosomes. The × is a subtelocentric chromosome of intermediate size and the Y, an acrocentric microchromosome. One population from the Edwards Plateau in Texas has 2N=29 in males and 2N=30 chromosomes in females with an X1X2Y sex chromosome mechanism. It is hypothesized that the X1X2Y mechanism arose from the XY condition via a whole arm translocation of the Y to one of the smallest pair of macrochromosomal autosomes.
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