<human>: Does the sentence "One crucial innovation in reconceptualizing genotypic and phenotypic variation was the anthropologist C. Loring Brace's observation that such variations, insofar as it is affected by natural selection, slow migration, or genetic drift, are distributed along geographic gradations or clines." answer the question "What is a problem common to phenotype-based descriptions of races?"

OPTIONS:
- yes
- no
<bot>: no