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Standard XII
Biology
Question

In AB group of blood, the two alleles are
  1. Dominant-recessive
  2. Co-dominant
  3. Epistatic-hypostatic
  4. Incompletely dominant

A
Incompletely dominant
B
Dominant-recessive
C
Co-dominant
D
Epistatic-hypostatic
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Solution
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A B
A AA AB
B AB BB
Co-dominance is a form of dominance where the alleles of a gene pair in heterozygotes are fully expressed. This results in offspring that is neither dominant nor recessive. Individuals with AB genotype have neither A blood group nor B blood group.
Dominant-recessive is shown by characteristics of the pea plant.
Incomplete dominance is shown in the inheritance of flower colour in snapdragon.
So, the correct option is 'Co-dominant'.

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