There are 2 alleles 
(for normal teeth) and
(for vampiric fangs),
which are arranged in 3 possible genotypes 
,
, and
,
which, yield 2 possible phenotypes 
and 
There are 2 alleles (for normal teeth) and
(for vampiric fangs),
which are arranged in 3 possible genotypes ,
, and
,
which, yield 2 possible phenotypes
and