The U.S. infant mortality rate generally declined throughout the 20th century, from 100 infant deaths per 1,000 live births in 1900 to 6.89 infant deaths per 1,000 live births in 2000.
hemoglobinopathies are genetic inherited disorders of hemoglobin the oxygen carrying protein of the red blood cells the hemoglobin molecule is composed of four separate polypeptide chains of amino acids two alpha chains and two beta chains as well as four iron bearing heme groups that bind oxygenemoglobinopathies are genetic inherited disorders of hemoglobin the oxygen carrying protein of the red blood cells the hemoglobin molecule is composed of four separate polypeptide chains of amino acids two alpha chains and two beta chains as well as four iron bearing heme groups that bind oxygen
INTRODUCTION. It is well known that mutations in DNA can have major health consequences. When the hemoglobin gene suffers a mutation resulting in the substitution of valine (nonpolar) for glutamine (polar) on the protein surface, the end result is sickle cell disease if both hemoglobin alleles carry the mutation. Interestingly, if only one copy is mutated, resistance to malaria results.