MCQ
What is indicated by $'A'$ and $'B'$ in the given diagram?


- A$A$ - Exine, $B$ - Male flower
- B$A$ - Tube nucleus, $B$ - Exine
- ✓$A$ - Stigma, $B$ - Female flower
- D$A$ - Intine, $B$ - Pollen tube

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$I.$ 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?