I the concept of hypodescent

In societies that regard some races or ethnic groups of people as dominant or superior and others as subordinate or inferior, hypodescent refers to the automatic assignment by the dominant culture of children of a mixed union or sexual relations between members of different socioeconomic groups or ethnic groups to the subordinate group.[1] The opposite practice is hyperdescent, in which children are assigned to the race that is considered dominant or superior.

Thom bell , bobby martin , and norman harris .

When the speaker in sonnet 30 states “drown an eye”