For a gene with two alleles, a heterozygote would carry one of each type. Two traits must be linked for crossing-over to occur. The autosomal chromosomes determine the gender of an individual. In order for an autosomal recessive trait to appear phenotypically, the individual must be homozygous for that trait. The sex chromosomes, X and Y determine gender.
Yellow fangs is an autosomal dominant trait in werewolves.
A yellow fanged male werewolf mates with a white fanged female werewolf. A litter of three werewolves with yellow fangs and 2 werewolves with white fangs is produced. Both parents are homozygous for the trait. Both parents are heterozygous for the trait. The female is ff.