Which of the following terms is correctly paired with its description?

Question

Responses

Spindle fibers - the phase where chromatids line up in the middle of the cell
Spindle fibers - the phase where chromatids line up in the middle of the cell

Centromere - where chromatids align during metaphase
Centromere - where chromatids align during metaphase

Sister chromatids - an arrangement of four chromatids that allows for crossing over
Sister chromatids - an arrangement of four chromatids that allows for crossing over

Centriole - cellular organelle that uses spindle fibers to pull sister chromatids apart
Centriole - cellular organelle that uses spindle fibers to pull sister chromatids apart

Answer 1

Let's evaluate each pairing for correctness:

1. Spindle fibers - the phase where chromatids line up in the middle of the cell

   • Incorrect. Spindle fibers help align the chromatids during metaphase, but they are not the phase itself.

2. Centromere - where chromatids align during metaphase

   • Incorrect. The centromere is the region of the chromosome where sister chromatids are joined, but it is not the location where they align. They align along the metaphase plate during metaphase.

3. Sister chromatids - an arrangement of four chromatids that allows for crossing over

   • Incorrect. Sister chromatids are two identical copies of a single replicated chromosome, not an arrangement of four chromatids. The arrangement involving four chromatids occurs during prophase I of meiosis (tetrad formation), but it does not describe sister chromatids.

4. Centriole - cellular organelle that uses spindle fibers to pull sister chromatids apart

   • Incorrect. Centrioles are involved in organizing the spindle fibers, but they do not pull sister chromatids apart. The spindle fibers, which are produced by the centrosomes (that contain the centrioles), are responsible for this action.

Given the explanations above, none of the provided terms are correctly paired with their descriptions.