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2/11/09 Incomplete Dominance Incomplete and Co‐Dominance • When 2 types of alleles that are equally dominant form an intermediate or “mixed” phenotype • Example: Four o’Clock Flowers When Dominant and Recessive aren’t what they appear to be! Example: In flowers White + Red = Pink Incomplete Dominance Incomplete Dominance Co‐dominance • When both alleles for a gene are expressed in the heterozygous offspring • Neither is dominant or recessive, both “show” Example: In flowers White + Red = White & Red spots 1 2/11/09 Co‐dominance Co‐dominance Example: roan cattle or horses Hybrid pink and white camellia; an example of co-dominance. Picture taken in Japan. 2
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