The cell represented in the image is undergoing the Metaphase of Mitosis. During Metaphase, the third phase, the duplicated genetic material is connected to the spindle fibersfrom centrioles. This means that the centrioles are connected to the chromosomes to start to separate the genetic material in two. The step right before what's shown is when the fibers connect to the chromosomes. The cell plate would be formed prematurely after this image, not before, so B) is wrong. The cell moving prematurely to a non-dividing phas would also happen after the image, there fore C) is also incorrect. The centrosomes formation occur along with the formation of the chromosomes, so it wouldn't be immediately before the image also, as it would have occured when the mother cell was being produced. Therefore, D) is also incorrect. The thing that happens right before this phase that could provoke the assimetry of chromosomes in both daughter cells is the capturing of the centromere by a spindle fiber. If the centrioles connect to only one side of the centromere, the result is that the chromosome won't be divided and will be pulled as a whole to one side, producing the assimetry described. So, the correct answer is a) A spindle fiber captured a chromosome on one side of the centromere, but a spindle fiber from the other centriole failed to capture it on the opposite side.
