Q.Give reasons: Genetic code is 'universal'.
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Start your 14-day free trial to unlock the full solution →Step 1. Universality means that nearly all known living systems, from bacteria to plants to animals, use nucleic acids and the same three-base (triplet) codons to direct protein synthesis from amino acids.
Step 2. For example, the mRNA codon UUU specifies phenylalanine in the cells of essentially every organism examined, whether prokaryote or eukaryote, not just in one species or group.
Step 3. This universality is strong evidence that the genetic code evolved very early in the history of life and has been conserved with only minor modification ever since, since an independently-evolved code in each lineage would be extremely unlikely to converge on the exact same codon assignments. …
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