Question
Differentiate between the following:
- Polygenic inheritance and Pleiotropy.
- Dominance, Codominance and Incomplete dominance.
✓
Answer
- Pleiotropy:
- In this, a single gene controls more than one phenotype.
- The F, resembles one of the parents, i.e., dominant parent.
- There is no gradation in the phenotype.
- Dominance:
- It is the phenomenon in which one allele of a gene expresses itself and suppresses the expression of the other (recessive) allele of the same gene, when they are present together in a hybrid
- The hybrid resembles one of the parents.
- Codominance:
- It is the phenomenon in which two alleles of a gene are equally dominant and express themselves in the presence of the other.
- The hybrid shows characters of both the parents.
- Incomplete dominance:
- It is the phenomenon in which neither of the two alleles of a gene is completely dominant over the other.
- The hybrid is intermediate between the two parents.
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