What biological concept explains the hairless gene influencing tooth structure in Xolos?
Answer
Pleiotropy
Pleiotropy is the biological phenomenon where a single gene influences two or more seemingly unrelated phenotypic traits. In the case of the Xoloitzcuintli, the dominant gene responsible for causing the absence of hair, located in the *FOXI3* gene, concurrently causes an abnormal development of the tooth structure. This results in the recognized trait of missing premolars. The correlation between the hairless phenotype and the dental anomalies exemplifies pleiotropy, showing how one specific genetic determinant can have widespread effects across different bodily systems.
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