Answer :
Complete dominance is the correct term for an instance in which the expression of an allele of a gene completely masks the expression of another gene.
- We need to remember what it means to be dominant in order to define total dominance in biology. A dominating object has total authority or control over another item. Therefore, a dominant phenotype is one that is caused by a dominant gene, but a recessive phenotype only appears when the dominant gene is absent. This is in line with the dominance concept.
- According to the rule (or principle) of dominance, a dominant allele will always cover up the existence of a recessive gene.
- Complete dominance is a kind of dominance in the heterozygous state when the dominant allele totally obscures the effects of the recessive allele.
- For instance, the characteristic represented by two dominant alleles (such as AA) will manifest in the person who has them. However, if a person has two alleles that are recessive and dominant, respectively (for example, Aa), the dominant allele will be expressed while the recessive allele would be silenced.
- As a result, the phenotype of the heterozygote (Aa) will be identical to that of the dominant homozygote (AA). This state is known as complete domination.
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