Multiple Choice
Which trait is an example of incomplete dominance in humans?
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13. Mendelian Genetics
Incomplete Dominance vs. Codominance
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Which of the following is an example of incomplete dominance in humans?
A
Freckles
B
Wavy hair
C
Sickle cell trait
D
ABO blood type
Verified step by step guidance1
Understand the concept of incomplete dominance: Incomplete dominance is a form of inheritance where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes. This means that neither allele is completely dominant over the other, resulting in a blended phenotype.
Identify examples of incomplete dominance: In humans, one classic example of incomplete dominance is wavy hair. This occurs when one parent has curly hair and the other has straight hair, resulting in offspring with wavy hair, which is an intermediate phenotype.
Analyze the options given: Freckles, sickle cell trait, and ABO blood type are not examples of incomplete dominance. Freckles are a dominant trait, sickle cell trait is an example of codominance, and ABO blood type is an example of multiple alleles and codominance.
Focus on the correct example: Wavy hair is the correct example of incomplete dominance in humans, as it results from the blending of curly and straight hair traits.
Conclude with the understanding: Recognize that incomplete dominance results in a phenotype that is a mix of the two parental traits, unlike complete dominance or codominance, where distinct traits are expressed.
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