Heterozygotes at the sickle-cell locus produce both normal and abnormal (sickle-cell) hemoglobin (see concept 11.4). when hemoglobin molecules are packed into a heterozygote’s red blood cells, some cells receive relatively large quantities of abnormal hemoglobin, making these cells prone to sickling. in a short essay (approximately 100–150 words), explain how these molecular and cellular events lead to emergent properties at the individual and population levels of biological organization.