I have Russo's boa constrictor book. I think the genetics chapter (from which the quote comes) is disappointing. Some of the terminology is either misleading or wrong. This includes making a distinction between codominance and incomplete dominance. We are working with breeding patterns, and both codominance and incomplete dominance have the same breeding pattern. Beyond that level, the texts do not agree on definitions. And saying that a super is dominant is just plain wrong. Originally, a super was homozygous for a mutant gene that is codominant to its normal allele. The term has been used so loosely that now a super seems to be homozygous for a mutant gene that is either dominant or codominant to its normal allele.

Paul Hollander

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