Identify the blood group allele(s) which do/does not express itself/themselves in heterozygous condition but express, when present in homozygous condition.

I^{A}

and

I^{B}

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I^{B}

and

I^{O}

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I^{O}

only

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I^{A}

only

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Solution

The correct option is C $I^{O}$ only
The human blood group is determined by three alleles, $I^{A}, I^{B}, I^{O} / i .$ The recessive allele $(I^{O} / i)$ expresses itself only in homozygous condition. In a heterozygous state, it is dominated by the dominant alleles $(I^{A}$ or $I^{B})$ .

Suggest Corrections

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