A gene showing codominance has :

  • Option 1)

    alleles tightly linked on the same chromosome

  • Option 2)

    alleles that are recessive to each other

  • Option 3)

    both alleles independently expressed in the hetero zygote

  • Option 4)

    one allele dominant on the other

 

Answers (2)

As learnt in

Co-dominance explained in red-blood cells -

Red-blood cells are controlled by gene (I). RBC's have sugar attached to surface which is controlled by the gene (I). The gene (I) has three alleles : IA , IB and i

 

- wherein

The allele of gene (I), IA and IB process sugar of different forms while  i does not produce any.

 

 A gene shows codominance when both alleles in heterozygous condition, express their traits independently instead of showing dominant-recessive relationship and such alleles are called codominant alleles. 


Option 1)

alleles tightly linked on the same chromosome

This option is incorrect.

Option 2)

alleles that are recessive to each other

This option is incorrect.

Option 3)

both alleles independently expressed in the hetero zygote

This option is correct.

Option 4)

one allele dominant on the other

This option is incorrect.

3

 

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