Assess your understanding of incompletely dominant and codominant traits by clicking and dragging the labels to the correctly complete each sentence, and then arrange the sentences in a logical order. B Drag the text blocks below into their correct order. heterozygote in this situation, a displays a phenotype that is intermediate between that of the two straight incomplete Another example is the case of expressed in a heterozygote. where all alleles are equally balanced polymorphism For example, the offspring of a homozygous dominant individual displaying air and a homozygous recessive individual displaying curly air will be heterozygotes displaying the intermediate phenotype of wavy air. homozygotes Traits exhibiting simple dominant or recessive inheritance are controlled by the expression of set(s) of alleles. codominance three An example of codominance occurs in blood phenotypes, where an individual possessing an A blood type allele and a B blood type allele has a blood phenotype of one However, variations of these inheritance patterns exist, such as in the case of dominance. AB invariant
The Correct Answer and Explanation is:
Here is the correct order of sentences for understanding incomplete dominance and codominance:
- In this situation, a heterozygote displays a phenotype that is intermediate between that of the two homozygotes.
- Another example is the case of codominance, where all alleles are equally expressed in a heterozygote.
- For example, the offspring of a homozygous dominant individual displaying straight hair and a homozygous recessive individual displaying curly hair will be heterozygotes displaying the intermediate phenotype of wavy hair.
- Traits exhibiting simple dominant or recessive inheritance are controlled by the expression of one set of alleles.
- An example of codominance occurs in blood phenotypes, where an individual possessing an A blood type allele and a B blood type allele has a blood phenotype of AB.
- However, variations of these inheritance patterns exist, such as in the case of incomplete dominance.
Explanation:
Incomplete dominance and codominance are two variations of genetic inheritance patterns that differ from simple dominant-recessive relationships. Incomplete dominance occurs when a heterozygote exhibits a phenotype that is an intermediate blend of the two homozygous parent phenotypes. A classic example is human hair texture. If one parent has straight hair and the other has curly hair, their offspring may have wavy hair, which is neither straight nor curly but a mix of both.
Codominance, on the other hand, results in both alleles being fully and equally expressed in a heterozygote without blending. This means that rather than creating an intermediate phenotype, both traits appear distinctly. A well-known example is seen in blood types, where an individual inheriting both A and B alleles expresses AB blood type, demonstrating both characteristics simultaneously.
Both inheritance patterns highlight how genetic traits can be passed down in ways that do not conform strictly to dominant or recessive inheritance, adding complexity and variation to genetic expression. These concepts are fundamental to understanding diversity in biological traits and help explain the wide range of phenotypic expressions seen across species.
