Question

part b assessments
sketch an interphase cell and cells in different phases (stages) of mitosis to illustrate the whitefish cells life cycle. label the major cellular structures represented in the sketches and indicate cytokinesis locations. (the circles represent fields of view through the microscope.)
new cells in early interphase (daughter cells)
late interphase (parent cell)
prophase
metaphase
anaphase and early cytokinesis
telophase and advanced cytokinesis
magnification __________x

Explanation:

Interphase is the stage where the cell grows, replicates DNA. In prophase, chromatin condenses into chromosomes. Metaphase has chromosomes lined up at the cell - equator. Anaphase is when sister chromatids separate. Telophase is the final stage of mitosis with the formation of new nuclei. Cytokinesis is the division of the cytoplasm. For whitefish cells, during cytokinesis, a cleavage furrow forms. Label major structures like nucleus (in interphase), chromosomes (in mitotic phases), and indicate the location of the cleavage furrow for cytokinesis.

Answer:

Sketch should include:

• In interphase: A large nucleus with visible nucleolus and chromatin (threads - like).
• In prophase: Chromosomes starting to condense, nuclear envelope starting to break down.
• In metaphase: Chromosomes aligned at the equator of the cell, spindle fibers attached to centromeres.
• In anaphase: Sister chromatids moving towards opposite poles of the cell.
• In telophase: Chromosomes at the poles, new nuclear envelopes forming.

Indicate the location of the cleavage furrow (a constriction in the cell membrane) for cytokinesis in anaphase and telophase sketches. Also, label structures such as nucleus, chromosomes, nucleolus, and spindle fibers as appropriate for each stage.