By chromosomal translocation, the duplicated gene sequences might have gotten from one chromosome to another.
When a chromosome splits and is partially or completely reattached to a separate chromosome, this is referred to as a chromosome translocation.
Two alpha (α) and two beta (β) polypeptide chains make up adult hemoglobin. On chromosome 16, there are two copies of the hemoglobin alpha gene (HBA1 and HBA2), each of which codes for an α-chain. On chromosome 11, the hemoglobin beta gene (HBB) encodes the β-chain. The mutation in chromosome 16 and chromosome 11 causes α- and β-globin gene clusters by translocation to cause thalassemia.
Therefore, the answer is chromosomal translocation.
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