For which demographic is red-green color blindness most prevalent?

Red-green color blindness is most prevalent among individuals of Northern European ancestry. This condition, also known as deuteranopia and protanopia, arises from genetic variations that affect the photoreceptors in the retina responsible for color perception. The prevalence of red-green color blindness in Northern European populations is significantly higher compared to other ancestries, with estimates suggesting that about 8% of men of Northern European descent are affected.

The genetic basis for this condition is linked to mutations on the X chromosome. Since men have only one X chromosome (XY), they are more likely to express the trait when they inherit the affected allele. Women, having two X chromosomes (XX), require two copies of the allele to exhibit color blindness, making the condition less common in female populations.

Given this genetic background and the statistical data regarding various ethnic groups, the higher prevalence in Northern Europeans is well-documented in genetic studies, which confirms the choice as the correct answer.