Final answer:
A silent point mutation example for the base sequence GTT TCT is changing it to GTG TCT, which doesn't alter the resulting amino acid Valine due to the redundancy of the genetic code.
Step-by-step explanation:
An example of a silent point mutation in the base sequence GTT TCT would be changing the base sequence to GTG TCT. The codon GTT codes for the amino acid Valine, and the codon GTG also codes for Valine. Because the genetic code is redundant, some amino acids are coded by more than one codon, and in this case, the replacement of the third base from T to G does not change the encoded amino acid, hence it's a silent mutation.