Final answer:
The question is addressing the primary structure of proteins and involves the notation of amino acid sequences in relation to the β-globin gene variants, which could be related to genetic conditions like sickle cell anaemia. The number of strips might be bands from gel electrophoresis.
Step-by-step explanation:
The question seems to be asking about the primary structure of proteins and the notation of amino acid sequences, potentially in the context of genetics or biochemistry related to haemoglobin. The primary structure of a protein is the linear sequence of its amino acids, which are joined by peptide bonds. This structure is determined by the sequence of nucleotides in the encoding gene.
The letters βA and βS mentioned in the question are likely referring to variants of the β-globin gene, which are involved in conditions such as sickle cell anemia (βS) and a normal gene (βA). The number of strips could be referring to electrophoresis gel results, with the number of bands corresponding to genotypes in a DNA test. Each band represents a fragment of DNA detected during the gel electrophoresis process.