Multiple Choice
In a genetic cross involving codominant genes, what is the expected phenotype of the offspring if both parents are heterozygous?
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13. Mendelian Genetics
Incomplete Dominance vs. Codominance
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Which of the following is an example of codominance in genetic traits?
A
AB blood type in humans
B
Eye color in fruit flies
C
Height variation in humans
D
Pink flowers in snapdragons
Verified step by step guidance1
Understand the concept of codominance: Codominance occurs when two different alleles for a genetic trait are both expressed equally in the phenotype. Neither allele is dominant or recessive, and both contribute to the organism's characteristics.
Identify examples of codominance: Look for traits where both alleles are visibly expressed in the phenotype. In the case of AB blood type in humans, both A and B alleles are expressed equally, resulting in a blood type that has characteristics of both alleles.
Evaluate the other options: Eye color in fruit flies, height variation in humans, and pink flowers in snapdragons are not examples of codominance. Eye color and height are typically influenced by multiple genes and environmental factors, while pink flowers in snapdragons are an example of incomplete dominance, where the phenotype is a blend of the two alleles.
Compare the examples: Codominance is distinct from incomplete dominance, where the phenotype is a mix rather than a full expression of both alleles. In AB blood type, both alleles are fully expressed, unlike the blending seen in pink snapdragons.
Conclude with the correct example: Based on the understanding of codominance, AB blood type in humans is the correct example, as it clearly demonstrates the equal expression of both alleles in the phenotype.
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