Yes, lip shape is significantly influenced by genetics. Multiple genes contribute to the variation we see in lip fullness and shape.
The Role of Genes in Lip Shape
Research has identified specific genes that play a role in determining lip shape. One such gene is TBX15. Studies have linked this gene to lip thickness and have traced its presence back to ancient human populations like Denisovans. This suggests that variations in TBX15, passed down through generations, contribute to differences in lip shape among modern humans. For example, a study by UCL found that the TBX15 gene, which contributes to lip shape, was linked with genetic data found in the Denisovan people. https://www.ucl.ac.uk/news/2021/feb/genes-face-shape-identified Furthermore, genetic factors can account for more than 70% of the variation in lip prominence. https://pmc.ncbi.nlm.nih.gov/articles/PMC5008732/ This highlights the substantial contribution of heredity to this trait. Another study identified five genes that help to form the face, including the features of the lips. https://www.science.org/content/article/five-genes-help-form-face The inheritance of lip shape can be complex, however, often involving multiple genes and their interactions.
Inheritance Patterns
Lip shape, like other physical traits, is passed down through generations via sexual selection and genetic diversity. This means that the traits of both parents, and even more distant ancestors, can influence the lip shape of their offspring. While inheriting full lips from a great-grandmother is entirely possible, the actual expression of this trait depends on the combination of genes received from both parents and the complex interplay between those genes. https://www.quora.com/My-parents-have-very-thin-lips-the-only-full-lips-in-my-family-has-my-great-grandmother-Is-it-possible-that-I-inherited-the-trait-from-her
Examples
- A child with parents who both have thin lips might still inherit genes for fuller lips from their grandparents or more distant ancestors.
- Conversely, a child with parents who have full lips may inherit genes for thinner lips. The outcome depends on the specific combination of genes they inherit and how those genes interact.
