$Statement A$: For a particular character in an individual,each gamete gets only one allele.
$Statement B$: Chromatids of a chromosome split (separate) and move towards opposite poles during anaphase of mitosis.

• A
  $Statement A$ is correct and $Statement B$ is wrong.
• B
  Both the statements are correct and $B$ is the reason for $A$.
• C
  $Statement B$ is correct and $Statement A$ is wrong.
• D
  Both the statements are correct and $B$ is not the reason for $A$.