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      • Sometimes both alleles of a particular gene are expressed in a dominant fashion, meaning both alleles for the same characteristic are simultaneously expressed in the heterozygote. This is called codominance.
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  2. Terms in this set (5) Codominance. A condition in which neither of two alleles of a gene is dominant or recessive. codominant alleles. Pairs of alleles that both affect the phenotype when present in a heterozygote. what. expression.

  3. Codominance. Sometimes both alleles of a particular gene are expressed in a dominant fashion, meaning both alleles for the same characteristic are simultaneously expressed in the heterozygote. This is called codominance. Some flowering plants display this type of inheritance.

  4. Sometimes the heterozygotes show a third phenotype due to incomplete dominance or codominance and sometimes there are more than two alleles for a trait in a population. Multiple Alleles and Codominance. Human blood types provide an excellent example of multiple alleles and codominance.

  5. As you start learning more about genetics in AP Biology, you will learn about dominance and how it refers to the relationship between two alleles, which are variations of a gene. When there’s a dominant relationship between alleles, one of the alleles will “mask” the other to help and influence a specific trait.

  6. Codominance is a relationship between two alleles for the same gene in which both alleles are expressed equally in the phenotype of the heterozygote. The reddish-brown and white coat color in the example below has codominant alleles for reddish-brown coat color and white coat color in cows.

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