Using data on mother-offspring phenotypic associations, they found that for ∼9 out of 10 offspring, the phenotype of the offspring was consistent with a single-locus X-linked dominant model of inheritance. The authors then looked for a pattern of inheritance that could explain the variation in tusk morphology observed in the field. Analyses of whole-genome sequences from individuals with and without tusks supported the hypothesis of a more severe population decline among tusked compared with tuskless individuals. also investigated whether these phenotypic changes were accompanied by a genetic signature.
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