John W. Bickham, Karen A. Bjorndal, Mike W. Haiduk, William E. Rainey, The Karyotype and Chromosomal Banding Patterns of the Green Turtle (Chelonia mydas), Copeia, Vol. 1980, No. 3 (Sep. 6, 1980), pp. 540-543
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Bickham et al. (1980) studied this question.