Sorry, i don't know #1, but i know # 2, there are 64 possible combinations of codons (groups of 3 nucleotides), each coding for a different amino acid. The problem is that there are only twenty something amino acids. This means that some of the 64 combinations will make the same amino acid. The wobble effect says that a number of codons can code for the same amino acid, but a single codon cannot code for more than one amino acid.
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