Multiple alleles are present:

1. on different chromosomes
2. at different loci on the same chromosome
3. at the same locus of the chromosome
4. on non-sister chromatids

Subtopic:  Dominance Deviation from Mendel: 2 |
NEET - 2015
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A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offspring?

1. A and B
2. A, B and AB
3. A, B, AB and O
4. Only O

Subtopic:  Dominance Deviation from Mendel: 2 |
 81%
From NCERT
NEET - 2015
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If two persons with' AB' blood group marry and have the sufficiently large number of children, these children could be classified as 'A' blood group: 'AB' blood group: 'B' blood group in 1: 2: 1 ratio. The modern technique of protein electrophoresis reveals the presence of both' A' and 'B' type proteins in 'AB' blood group individuals. This is an example of:
1. Incomplete dominance
2. Partial dominance
3. Complete dominance
4. Codominance
Subtopic:  Dominance Deviation from Mendel: 2 |
 85%
From NCERT
AIPMT - 2013
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ABO blood groups in humans are controlled by the gene I. It has three alleles – IA IB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

1. Three

2. One

3. Four

4. Two

Subtopic:  Dominance Deviation from Mendel: 2 |
 84%
From NCERT
AIPMT - 2010
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ABO blood grouping is controlled by gene I which has three alleles and shows co-dominance. There are six genotypes. How many phenotypes in all are possible?

1.  three 2.  four 
3.  five 4.  six

Subtopic:  Dominance Deviation from Mendel: 2 |
 92%
From NCERT
AIPMT - 2010
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