In which phase of meiosis do spindle fibers pull tetrads into the middle of the cell?

In which phase of meiosis do spindle fibers pull tetrads into the middle of the cell?

• A. Metaphase 1
• B. Anaphase 1
• C. Telophase 1
• D. Interphase 1

Answer: (A)

In meiosis, the correct phase where spindle fibers pull tetrads (paired homologous chromosomes) into the middle of the cell is during metaphase 1. This phase is characterized by the alignment of the tetrads along the metaphase plate, which is the equatorial plane of the cell. The spindle fibers, which are essential for the separation of chromosomes, attach to the kinetochores of the homologous chromosomes in the tetrads. This arrangement ensures that each daughter cell will receive one chromosome from each homologous pair in the subsequent separation stages. During anaphase 1, the spindle fibers do not pull the tetrads to the middle; rather, they pull the homologous chromosomes apart to opposite poles of the cell. Telophase 1 occurs after the alignment and pulling of the chromosomes, where the cell begins to divide, and interphase 1 refers to the phase prior to meiosis itself, where the chromosomes are not yet condensed into tetrads. Thus, metaphase 1 is the only phase where the tetrads are actively being positioned in the middle of the cell.

In meiosis, the correct phase where spindle fibers pull tetrads (paired homologous chromosomes) into the middle of the cell is during metaphase 1. This phase is characterized by the alignment of the tetrads along the metaphase plate, which is the equatorial plane of the cell. The spindle fibers, which are essential for the separation of chromosomes, attach to the kinetochores of the homologous chromosomes in the tetrads. This arrangement ensures that each daughter cell will receive one chromosome from each homologous pair in the subsequent separation stages.

During anaphase 1, the spindle fibers do not pull the tetrads to the middle; rather, they pull the homologous chromosomes apart to opposite poles of the cell. Telophase 1 occurs after the alignment and pulling of the chromosomes, where the cell begins to divide, and interphase 1 refers to the phase prior to meiosis itself, where the chromosomes are not yet condensed into tetrads. Thus, metaphase 1 is the only phase where the tetrads are actively being positioned in the middle of the cell.