To be more correct, the left side is alkali metals
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If the mans father could not roll his tongue, then the father has a genotype of rr.
Now if the man (the son) can roll his tongue this mean he has a genotype of either RR or Rr.
Because the father has a genotype of rr, that means the son has to have at least one allele of r.
This means the genotype of the man is Rr.
Nonsense mutations occur when a codon that is supposed to specify an amino acid is changed to a stop codon instead. This results in a protein that is shorter than normal because it cannot finish adding all the necessary amino acids.