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Two genotypes of the two alfa chain deletions
cis configuration --/aa Common in Asians
trans configuration -a/-a Common in African Americans
To remember these remember that:

cis configuration --/aa Common in Asians
trans configuration -a/-a Common in African Americans
To remember these remember that:
- cis configuration implies a horizontal orientation just like the wide horizontal Asia continent
- trans configuration implies vertical orientation just like the tall and narrow African continent