Pinstripes have a plain golden brown colour. The pattern is reduced to simple black lines. Two more or less continuous parallel black lines delimit the clearer ridge of the animal. From those 2 parallels arise other perpendicular lines.

Some definitions of genetics...

Allele : alleles are the different versions of the same gene
Dominant allele : an allele is said to be dominant if he is able to pass alone a characteristic trait of the parents to the descendants.
Recessive allele : an allele is said to be recessive if he is not able to pass alone a characteristic trait of the parents to the descendants.
Co-dominant allele : alleles are said to be co-dominant when together they are able to pass a characteristic trait to the descendants.
Homozygous : An individual is said to be homozygous for a given gene if he possesses two identical alleles of this gene.
Heterozygous : An individual is said to be heterozygous for a given gene if he carries two different alleles.

Pinstripe gene is dominant.

male	female	descendants
Pinstripe	Pinstripe	100% of the descendants are Pinstripe
Pinstripe	normal	50% of the descendants are Pinstripe 50% of the descendants are normal