It is called Incomplete dominance.
Incomplete dominance refers to the situation wherein the two true-breeding parents mated to create an intermediate child (sometimes referred to as heterozygous).
Alternate names for it include partial dominance and intermediate inheritance. In the case of partial dominance, the variations (alleles) are exhibited in a decreased ratio rather than as dominant or recessive.
When both alleles of a gene are only partly transcribed at a locus, it is known as incomplete dominance. This sort of gene interaction frequently produces an intermediate or distinct phenotype. Additionally called partial dominance.
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