% of DNA mix do not accurately describe the changes For example, an African person can have 0.1% European genes and still may look fully blonde with blue eyes

% of DNA mix do not accurately describe the changes For example, an African person can have 0.1% European genes and still may look fully blonde with blue eyes and European facial features. What matters is what that 0.1% is bringing. If those genes are largely not affecting anything at 20% well then why we should care if it's 0.1% or 20%