Healthy human adults have two a-globins and two b-globins. Fetuses have two a-and two g-globins. As a result fetal haemoglobin ... The alpha and beta subunits of hemoglobin are encoded by separate genes. Normally, an individual has four alpha-encoding genes ... he·mo·glo·bin / ˈhēməˌglōbin/ (Brit. hae·mo·glo·bin) • n. Biochem. a red protein responsible for transporting oxygen in the ... The globins are identified by Greek letters, and a very large number have been discovered, many of them related to diseases of ...