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Why humans evolved blue eyes.

Paola Bressan1

  • 1Dipartimento di Psicologia Generale, University of Padova, Padua, Italy.

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Summary
This summary is machine-generated.

Human blue eyes evolved rapidly because the blue-eye allele acts as a "greenbeard" gene. This gene favors mating with and investing in blue-eyed individuals, promoting its own spread through sexual and parental selection.

Keywords:
Fisher’s runawaybiological ornamentseye colorgreenbeardsmate choiceparental selectionsexual selectionsocial selection

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Area of Science:

  • Evolutionary biology
  • Human genetics
  • Ophthalmology

Background:

  • Pale irides, like blue eyes, offer less retinal protection from sunlight compared to darker irides.
  • This increased susceptibility to sunlight may elevate the risk of certain eye diseases.

Purpose of the Study:

  • To apply evolutionary theory to explain the rapid spread of the human blue-eye allele.
  • To investigate the potential mechanism of "greenbeard" gene action in human eye color evolution.

Main Methods:

  • The study proposes an evolutionary model based on "greenbeard" genetics.
  • It analyzes the role of mate preference and parental investment in the propagation of the blue-eye trait.
  • It draws parallels with sexual selection (peacock tails) and parental selection (nestling mouths).

Main Results:

  • The blue-eye allele is hypothesized to function as a "greenbeard" gene, promoting its own proliferation.
  • Individuals with a preference for blue eyes are more likely to mate with blue-eyed partners and invest in blue-eyed offspring.
  • This creates a self-reinforcing cycle, or "double runaway" evolution, through sexual and parental selection.

Conclusions:

  • The rapid spread of blue eyes can be explained by their function as an "ornament" gene that promotes recognition and support of its own copies.
  • This mechanism allows the blue-eye gene to prosper by benefiting both kin and non-related individuals carrying the same allele.
  • The study suggests that "greenbeard"-like mechanisms, previously considered unlikely, may play a significant role in human evolution.