Examples of Incomplete Dominance

What is Incomplete Dominance?

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Mechanism of Incomplete Dominance

Incomplete dominance is a post-Mendelian discovery. Carl Correns, a German botanist, conducted an experiment on four o’clock flowers and proposed the term “incomplete dominance”. Incomplete dominance refers to a condition where a heterozygous individual does not exhibit the dominant allele but instead shows a phenotype that is intermediate between the phenotypes of the dominant and recessive alleles. It is also known as partial dominance or intermediate inheritance. For example: In four o’clock plant there are two types of pure breeding plants, red flowered and white flowered. On crossing the two, F1 plants produced pink flowers. The pink flower is due to incomplete dominance....

Concept of Dominance

Generally, genes are present in pairs in an individual, with one copy inherited from each parent. In complete dominance, one allele is fully expressed, masking the effects of the other allele. However, in incomplete dominance, the heterozygous genotype (having two different alleles) results in a phenotype that is a combination or blend of the phenotypes associated with each allele. The mechanism of incomplete dominance is as follows:...

Incomplete Dominance and Codominance

The concept of dominance describes the relationship between alleles of one gene. It determines how traits are expressed in an organism’s phenotype based on the combination of alleles it inherits. In a pair of alleles for a specific trait, one allele may show its influence over the other, resulting in a dominant phenotype, while the other allele remains hidden or recessive. This means that the dominant allele is expressed in the phenotype, and its traits are observed, while the recessive allele is not phenotypically expressed in the presence of the dominant allele. A heterozygous gene consists of a pair of dissimilar alleles, whereas a homozygous gene carries two identical alleles. In heterozygous alleles, each allele contains distinct information regarding traits. When we describe one allele as dominant over the other, it can be due to two possible reasons:...

Examples of Incomplete Dominance

Incomplete dominance and codominance are two different types of inheritance that involve the expression of alleles and the resulting phenotypes in organisms. In incomplete dominance, neither allele completely dominates or masks the other allele. Instead, the heterozygous phenotype is an intermediate or blended expression of both alleles. For example, in snapdragons, a red allele and a white allele may result in pink flowers in heterozygous individuals....

FAQs on Incomplete Dominance

Example of incomplete dominance is as follows:...