I want to know the answer to the following question:
What is a problem common to phenotype-based descriptions of races?
All the background I'm provided with is that "This point called attention to a problem common to phenotype-based descriptions of races (for example, those based on hair texture and skin color): they ignore a host of other similarities and differences (for example, blood type) that do not correlate highly with the markers for race.". Is that enough to answer the question?
Answer: yes