American Heritage® Dictionary of the English Language, Fourth Edition
- n. A condition in which both alleles of a gene pair in a heterozygote are fully expressed, with neither one being dominant or recessive to the other.
- co- + dominance (Wiktionary)
“Dominance is not the most frequent type of Mendelian inheritance; in fact it is the exception, not the rule, with codominance occurring twice as often as dominance.”
“And yet, we teach dominance first and then codominance, incomplete dominance and the rest as the exceptions.”
“But we like the genetic principle of codominance; and of course hybrid vigor.”
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