An allele in a heterozygote that completely masks the effect of the other allele and express itself in $F_{1}$ generation is ________.

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Solution

The masked allele is called recessive and the allele that expresses itself is called dominant. In presence of a dominant allele, the recessive character cannot be expressed i.e., masked. When a recessive allele is present in double dose, only the recessive character is expressed.

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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

	I		II
A	Dominance	i	In a heterozygous organism both alleles express themselves fully
B	Epistasis	ii	A single gene influences many characters
C	Pleiotropy	iii	One gene is suppressed by other gene.
D	Codominance	iv	One allele masks the other allele of the same gene

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