What is the inheritance pattern of the FOXI3 gene variant causing Xolo hairlessness?
Answer
Autosomal dominant manner
The defining characteristic of hairlessness in the Xoloitzcuintli is genetically determined by the presence of a specific variant within the FOXI3 gene. This variant is inherited in an autosomal dominant manner. This genetic principle signifies that only one copy of the altered gene, inherited from either parent, is sufficient for the trait—in this case, the near-total absence of hair—to be expressed in the offspring. This mechanism contrasts sharply with recessive traits, which require two copies of the specific allele for manifestation. The dominance of this mutation allowed it to become fixed within the ancient population across Mesoamerican civilizations over millennia.
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