Question

1. the diagram below shows six cells in various phases of the cell cycle. note the cells are not arranged in the order in which mitosis occurs and one of the phases of mitosis occurs twice. cells a and f show an early and a late stage of the same phase of mitosis. what phase is it? a. telophase c. prophase b. interphase d. anaphase 30. place the above cells in the correct order of the cell cycle, from beginning to end. a. d, a, c, f, e, b c. a, f, e, c, b, d b. d, a, f, c, e, b d. a, c, e, f, b, d

Explanation:

• Question 29:
• Prophase characteristics: In prophase, chromatin condenses into chromosomes, the nuclear envelope starts to break down, and spindle fibers begin to form. In cell A, we can see the early - stage of chromosome condensation and spindle fiber formation (labeled \(X\)). In cell F, the chromosomes are more condensed, and the spindle fibers are more prominent, which are features of prophase.
• Elimination of other options:
• Telophase: In telophase, the nuclear envelope reforms, and chromosomes de - condense. This is not the case in A and F.
• Interphase: In interphase, the cell is in a non - dividing state with a prominent nucleus and diffuse chromatin (like cell D), not the characteristics of A and F.
• Anaphase: In anaphase, sister chromatids separate and move to opposite poles (like cell E), which is different from A and F.
• Question 30:
• Cell cycle order:
• Interphase (D): The cell prepares for division with a large nucleus and diffuse chromatin.
• Prophase: First, early prophase (A) with initial chromosome condensation and spindle formation, then late prophase (F) with more condensed chromosomes.
• Metaphase (C): Chromosomes align at the equatorial plate.
• Anaphase (E): Sister chromatids separate.
• Telophase (B): Nuclear envelope reforms and cell starts to divide.

Answer:

• Question 29: C. prophase
• Question 30: B. D, A, F, C, E, B