Race refers to considered important by a society and used to categorize people. ethnicity, on the other hand, refers to

The answer is biological traits; cultural traits.
Race is pre-determined ever since you're born and ethnicity is the dominant culture that you held in your example.
Example: Jin Yiang came from both Asian parents and grew up in Mexico and following all of their cultures.
In this case, Jin Yiang is an Asian (race) with Mexican ethnicity.

Race refers to BIOLOGICAL TRAITS considered important by a society and is used to categorize people. Ethnicity, on the other hand, refers to CULTURAL TRAITS.