Looking through a light microscope at a cell undergoing division, you see that the condensed chromosomes have lined up along the midline of the cell. the homologous pairs are not joined in tetrads. each chromosome takes its own place in line, independent of its homolog. you are witnessing

Mitotic metaphase or metaphase II of meiosis

Explanation:

Metaphase in mitosis and metaphase II of meiosis II include alignment of chromosomes along the equator of the cell with help of spindle apparatus. Here, each chromosome has two sister chromatids.

Metaphase I of meiosis I includes alignment of homologous pairs along the equator of the cell. Since the observed cell have individuals chromosomes aligned along the mid line of the cell, it is metaphase of mitosis or metaphase II of meiosis.

the cytokine-activated janus kinase (jak)-signal transducer and activator of transcription (stat) pathway has an important role in the control of immune responses. dysregulation of jak-stat signaling is associated with various immune disorders.