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[junglepython2]

Things like handedness and hair colour are not as simple as dominant, recessive and co-dominant.

Each individual receives a set of genes from each parent. Called alleles, if one of those is dominant it will show through regardless of the other allele. So if an animal displays a dominant trait it either must have both dominant alleles or a dominant and a recessive as the dominant will mask the recessive. If this is the case it is called a Het for that trait.

If a trait is recessive such as albinism it must receive recessive alleles from both parents.

Co-dominant is when two different alleles are both displayed and neither is masked. An example is people with AB blood group. A and B are co-dominant while type O is recessive.

Despite this most traits are controlled by a combination of many different genes so it's not as simple as some people make out when predicting traits.