What is the effect of using continuous traits in racial identification?

• A. They limit the number of races
• B. They define a single race
• C. They are not used in classification
• D. They allow unlimited numbers of races

Answer: (D)

Continuous traits show that human variation exists on a spectrum rather than in fixed boxes. When you measure along a continuum—skin tone, facial metrics, genetic markers—the boundaries between groups aren’t inherently set in stone. As precision increases or new traits are considered, you can carve the spectrum into more and more categories. In theory, that means unlimited numbers of races can be defined. The idea contrasts with discrete labeling, which imposes a small, fixed number of categories.