An allele whose phenotypic effect is not observed in a heterozygote is known as _______.

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An allele whose phenotype effect is not observed in a heterozygote it is "masked" or hidden. Need 2 copies of a recessive allele to show recessive trait. The situation in which the phenotype of the heterozygote is intermediate between the phenotypes of individuals homozygous for either allele.

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F_{1}

Column I	Column II
a. Dominance	1. In heterozygous condition both alleles express to create a mixed phenotype
b. Codominance	2. More than two alleles for a gene controlling a single character
c. Multiple allelism	3. Two alleles in a heterozygote create an intermediate phenotype
d. Incomplete dominance	4. In a heterozygous condition only one allele expresses itself

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