Possibly ¼ for not
Because your mother does not have a normal gene
, she can only make eggs with a single copy of c677t, so you will receive one.
If your father is heterozygous, your chance of being heterozygous is 50%; if homozygous,, you will be too. Consult a board certified clinical geneticist who will inform you of the evidence-based facts with regard to possible risks. There is much nonsense on the internet.