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
2. On the basis of the study of this family, it is concluded that: a. The genes responsible for hemoglobins G and S cannot be alleles. b. The genes responsible for hemoglobin G and thalassemia cannot be alleles. c. The absence of hemoglobin A in individuals heterozygous for two hemoglobin genes does not provide critical evidence concerning the allelic relations of such genes.