Multiple Choice
What type of inheritance results in the expression of both A and B antigens in type AB blood?
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13. Mendelian Genetics
Incomplete Dominance vs. Codominance
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How is codominance expressed in an organism?
A
Neither allele is expressed, resulting in a lack of phenotype.
B
Both alleles are fully expressed, resulting in a phenotype that shows both traits equally.
C
One allele is dominant over the other, masking the recessive allele.
D
The alleles blend together to create an intermediate phenotype.
Verified step by step guidance1
Understand the concept of codominance: Codominance occurs when two different alleles for a gene are both fully expressed in a heterozygous individual, resulting in a phenotype that displays both traits equally.
Identify examples of codominance: A classic example is the ABO blood group system in humans, where both A and B alleles are expressed, resulting in an AB blood type.
Differentiate codominance from other genetic expressions: Unlike complete dominance where one allele masks another, or incomplete dominance where alleles blend to form an intermediate phenotype, codominance allows both alleles to be visible in the phenotype.
Consider the genetic makeup: In codominance, the genotype of the organism will have two different alleles that are both expressed, such as IAIB for blood type AB.
Visualize the phenotype: In codominance, the phenotype will show characteristics of both alleles equally, such as a flower with both red and white patches if red and white are codominant alleles.
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Incomplete Dominance vs. Codominance practice set
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