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STD 12 - 4. principal of inheritance and variation — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
Consider the following statement regarding $ABO$ blood group in human

$I.$ It is controlled by multiple allele

$II.$ It shows codominance

$III.$ Codominance can be manifested phenotypically in human

$IV.$ It follows the Mendel law of inheritance

Which of the following statements (s) are correct?

  • A
    Only $I$ is correct
  • ✓
    $I$ and $II$ are correct
  • C
    $II$ and $III$ are correct
  • D
    $IV$ and $II$ are correct
✓

Answer

Correct option: B.
$I$ and $II$ are correct
b
$ABO$ blood group is an example of codominance because both allele express themself and is govern by multiple allele means it is controlled by more than two allele. $ABO$ blood group system or $A, AB, B$ and $O$ blood group of human cannot judge by using physically the human individual

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