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Why is human height considered a polygenic trait?
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Growth
Various growth stages of the Emperor gum moth caterpillar (Opodiphthera eucalypti).
Human height is considered a polygenic trait because it is not determined by a single gene, but rather by the combined, small effects of many different genes and their variations.12
In genetic terms, more than 12,000 genetic variants contribute to an individual's stature. These genes act as a blueprint for growth by influencing complex biological processes, including:12
- Bone and Cartilage Development: Regulating the growth and elongation of bones.12
- Hormonal Regulation: Affecting the pathways of key hormones, such as growth hormone and insulin-like growth factor 1, which are essential for stimulating cell division and skeletal maturation.12
Because these numerous genetic factors work collectively to influence these physiological systems, height is classified as a quantitative or polygenic trait. While genetics sets the potential upper limit for an individual's height, environmental factors—such as nutrition, health, and socioeconomic conditions—determine how fully that genetic potential is realized.231