A student examines a thin section of an onion-root tip and records the number of cells that are in each stage of the cell cycle. She observes 94 cells in interphase, 14 cells in prophase, 3 cells in prometaphase, 3 cells in metaphase, 5 cells in anaphase, and 1 cell in telophase. If the complete cell cycle in an onion-root tip requires 22 hours, what is the average duration of each stage in the cycle? Assume that all cells are in the active cell cycle (not G0).

Discuss the cell cycle with the aid of a diagram. 6-8 hours INTERPHASE Sphase DNA I replicated 6-10 hours G, phase Cell metabolically active; duplicates organelles and cytosolic components starts replicating G, phase Cell growth continues enzymes and other proteins are synthesized and replication of centrosomes is completed 46 hours Exit from cell cycle nondividing cell) centrosomes. MITOTIC (M) PHASE Prophase Metaphase Anaphase Telophase

1) Examine the picture of an onion root tip with cells in various stages of the cell cycle. A student claims that interphase is the longest stage of the cell cycle. Another student claims that mitosis is the longest stage. Using evidence from the photo, determine which student is correct and why.   A) Mitosis is the longest stage because anaphase requires more time to separate chromatids.     B) Interphase is the longest stage because chromosomes are visible in the majority of the cells.     C) Mitosis is the longest stage because the majority of the cells in the photo are replicating their DNA.     D) Interphase is the longest stage because the majority of the cells in the photo have uncondensed chromatin and are not dividing.   Not Graded

Complete the table please % of cells in each stage =number of cells in stage × 100 /total Number of cells counted

Examine the picture of an onion root tip with cells in various stages of the cell cycle. A student claims that interphase is the longest stage of the cell cycle. Another student claims that mitosis is the longest stage. Using evidence from the photo, determine which student is correct and why A)mitosis is the longest stage because anaphase requires more time to separate chromatids B) interphase is the longest stage because chromosomes are visible in the majority of the cells C) mitosis is the longest stage because the majority of the cells in the photo are replicating their dna D) interphase is the longest stage because the majority of the cells in the photo have uncondensed chromatin and are not dividing

the light micrograph shows dividing cells near the tip of an onion root. identify and encircle a cell in each of the following stages: phrophase , prometaphase, metaphase ,anaphase and telophase. describe the major events occuring at each stage.

Select the phase of the cell cycle depicted in the image below where the paired chromosomes separate and move to opposite sides of the cell: prophase   telophase   interphase   anaphase   metaphase

Belgy Name: Date: Period: Mitosis Worksheet 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. Use the diagram to answer questions 1-7. Phases of the Cell Cycle 1) Cells A and early stage of the same phase of mitosis. What phase is it? 2) Which cell is in mg 3) Which cell rst phas sis? 4) In cell A, what structure is labeled X? 5) Which cell is in the "in between" phase of mitosis? 6) Place the diagrams in order from first to last. 7) Are the cells depicted plant animal cells? Explain your answer. 8) What is the longest phase of the cell cycle? 9) Why is mitosis important?

The following diagram is meant to help you understand how the amount of DNA in a cell changes as the cell cycle progresses. On the diagram, identify two of the stages of the cell cycle being described and identify how much DNA exists per cell, where a cell is defined as a distinct nucleus. Note that the sequence of images highlights one of the chromosomes of the cell. The other chromosomes, while also present, are faded in the background. Stage in Cell Cycle: A Status of Chromosomes: (Only one of the chromosomes is intensely colored) NANA INNNNNNN wwwww wwwNYA wwwww WXXXX VANNNNNN www Amount of DNA Per Cell: C NNNNA NNNNNN WWXXXXX NNNNNNE WNNNN www B NNNNN Between 1X and 2X 2X D 1X

Select the phase of the cell cycle depicted in the image below where chromatin condenses and the nuclear membrane dissolves: prophase   telophase   metaphase   anaphase   interphase