there is a quantitative difference in the proportion of alpha- and beta-chain variants to normal haemoglobin in the respective heterozygotes , and there is also a difference in the pattern of inheritance of alpha- and beta-thalassaemia : these could possibly be explained by assuming that man has one gene for the beta- and two for the alpha-chain .
C0544483
beta-chain
C0005283
beta-thalassaemia