By Natural Philosopher Mike Prestwood
Timeline Story

Phenotype Variation: Blue Eyes

Phenotype Variation: Blue Eyes

From Year 0 (BCE/CE): -8000
Post Date: 04/12/2024

Blue eyes emerged

stands out as a striking example of a genetic mutation that spread across populations. Traced back to a single individual living between 6,000 and 8,000 BCE in the region near the Black Sea, this genetic adaptation marks a notable divergence in the genetic makeup of modern humans. The mutation involved is a specific change in the OCA2 gene, which alters the way melanin is produced in the iris. Originally, all humans had brown eyes, but this mutation led to the reduction of melanin in the iris, resulting in blue eyes.

This change likely occurred during the Neolithic period, a time of significant human development and migration. As communities expanded and migrated from the Near East into Europe, the gene for blue eyes spread, becoming particularly prevalent among European populations. The spread of this trait exemplifies how a single genetic mutation can influence the physical characteristics of populations over thousands of years.

The occurrence of blue eyes in a single ancestor highlights the interconnectedness of human populations and the shared genetic heritage that links diverse groups back to common ancestors. This story not only reflects the complexity of human genetics but also the way in which our aesthetic and phenotypic diversity has evolved over millennia from relatively small genetic changes.

4 Minutes with Mike Prestwood: Weekly Wisdom Builder
May 26, 2024 Edition
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