Why having an extra finger is rare despite being a dominant trait
In short: In genetics, dominance doesn't always equal commonality. This video explores the biological paradox of polydactyly, explaining why a dominant gene doesn't automatically result in a widespread physical trait.
While having six fingers (polydactyly) is governed by a dominant gene, it remains an exceedingly rare occurrence. The video clarifies that genetic complexity means a single dominant trait can be suppressed or influenced by a vast array of other factors, preventing it from becoming a standard human feature.
Understanding this distinction is key to grasping how complex inheritance works. It serves as a primary example of why human traits are rarely the result of simple one-to-one genetic rules.
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- Summary by Intellect · source: Having Six Fingers Is a Dominant Trait
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