The mechanism of sex expression in D. deltoidea Wall. has been reported for the first time. The male has been shown to possess a pair of homomorphic sex chromosomes (ZZ) while the female have heteromorphic sex chromosomes (ZW). These results, in the light of earlier findings on the mechanisms of sex expression in the genus Dioscorea, suggest that different mechanisms may be operative in different species.The sex chromosomes in D. deltoidea Wall. are morphologically distinct from rest of the chromosomes and could be readily identified by an extended centromere which was submedian.
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Bhat et al. (1980) studied this question.
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