Question

most commonly used selectable marker​

Answer 1

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The most widely used selectable marker is bar gene isolated from Streptomyces hygroscopicus. It codes for phosphinothricin acetyl transferase (PAT) proteins of 183 amino acids and shows 85% DNA sequence homology with another marker gene pat isolated from Streptomyces viridochromogenes.

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Answer 2

$\huge \dag$ The most widely used selectable marker is bar gene isolated from Streptomyces hygroscopicus. It codes for phosphinothricin acetyl transferase (PAT) proteins of 183 amino acids and shows 85% DNA sequence homology with another marker gene pat isolated from Streptomyces viridochromogenes.