three types of alpha thalassaemia genetic determinants were detected : the 3.5 kb deletion which inactivates one alpha globin gene per chromosome ( -alpha/haplotype ) , a much larger deletion which removes both alpha globin genes ( - -/haplotype ) , and a non-deletion determinant which leaves both alpha globin genes intact .
C0002312
alpha thalassaemia
C2697529
one alpha globin gene