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Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation1 Mark
MCQ
For question two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$  and $(d) $ as given below.
Assertion: Codominant alleles lack dominant recessive relationship.
Reason: Codominant alleles show incomplete dominance.
  • A
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • ✓
    Assertion is true but reason is false.
  • D
    Both assertion and reason are false.
✓

Answer

Correct option: C.
Assertion is true but reason is false.
Such alleles which are able to express themselves in the presence of each other are called codominant. They do not show dominant recessive relationship and are able to express themselves independently when present together. For example blood group $A$ and $B$ shows codominance as when present together. They show $AB$ blood group. ln incomplete dominance, one of the alleles is more pronounced for example in Mirabilis jalapa when red $($dominant$)$ and white $($recessive$)$ flowers crossed the progeny is pink. Therefore, codominance is different from incomplete dominance.

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