Genotype: N / N [ Homozygous normal ]
The cat is noncarrier of the mutant gene.
It is very unlikely that the cat will develop Head Defect (BHD). The cat will never pass the mutation to its offspring, and therefore it can be bred to any other cat.
Genotype: N / BHD [ Heterozygous ]
The cat carries one copy of the mutant gene and one
copy of the normal gene.
Cats with one copy of the mutation will not have craniofacial defect but may produce a shortened facial structure (brachycephaly).
Genotype: BHD / BHD [ Homozygous mutant ]
The cat carries two copies of the mutant gene and
therefore it will pass the mutant gene to its entire offspring.
The cat is likely to develop Head Defect (BHD) and will pass the mutant gene to its entire offspring