Explain the terms Similarity, Identity and Homology with suitable examples.

In bioinformatics, understanding the concepts of similarity, identity, and homology is crucial for interpreting biological data, especially in sequence comparison tasks like those involving proteins or DNA sequences. These terms, although closely related, refer to different aspects of biological sequence comparison.

Similarity refers to the degree to which two sequences share common features, such as similar nucleotides in DNA or amino acids in proteins. Similarity is determined by comparing sequences and identifying the proportion of positions where the sequences have the same or similar residues. In nucleotide or protein sequences, similar residues may differ in their chemical properties but still perform similar functions. This is commonly quantified using substitution matrices like BLOSUM or PAM for protein sequences, which give scores based on the likelihood of one residue replacing another. For example, if two protein sequences share 80% of their residues in the same positions, they are said to be 80% _________ _________ __________ ______ _______ ____ ____ ______ ___ ____ _________ ______.
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