HINT FOR NEXT TIME: During interphase, individual chromosomes can’t be seen.
Early Prophase
Nice. “2” represents prophase.
HINT FOR NEXT TIME: During prophase, distinct chromosomes are visible for the first time.
Late prophase/ prometaphase
Nice! “3” represents late prophase/prometaphase.
HINT FOR NEXT TIME: By late prophase/prometaphase, the nuclear membrane is mostly gone, and a spindle has formed. But chromosomes are not yet in the middle of the cell.
Metaphase
Awesome: “4” represents metaphase.
HINT FOR NEXT TIME: During metaphase, the chromosomes are in the middle of the cell. Remember the “M” in “middle” and “metaphase.”
Anaphase
Awesome. “5” represents anaphase.
HINT FOR NEXT TIME: Anaphase is when the sister chromatids get pulled apart. Remember the “A” that starts “anaphase” and “apart.”
Telophase
Good! “6” represents telophase.
HINT: During telophase, the nucleus reforms. You can see two nuclei in one cell.
HINT FOR NEXT TIME: Look for a phase where there are two nuclei in one cell.
Great! “6” is telophase.
Cytokinesis
Awesome. “7” represents cytokinesis.
HINT FOR NEXT TIME: During cytokinesis, the cell is splitting apart into two daughter cells.
Nice! DNA replication occurs during interphase (diagram B).
HINT FOR NEXT TIME: You’re looking for interphase.
Sister chromatids are being pulled apart
Yes. Sister chromatids are pulled apart during anaphase (diagram C)
HINT FOR NEXT TIME: You’re looking for anaphase. Where do you see something being pulled apart?
The spindle has formed, and it’s stretching all the way across the cell.
Yes. During late prophase/prometaphase (A), a complete spindle has formed.
HINT FOR NEXT TIME: Find where the spindle — an array of microtubule fibers — stretches entirely across the cell.
The chromosomes condense, and the spindle begins to form.
Awesome! In early prophase, “E,” you see chromosomes and the start of spindle formation.
HINT FOR NEXT TIME: You’re looking for early prophase. Chromosomes are visible, but they’re inside a nuclear membrane.
Nuclei are reforming, and cytokinesis is beginning.
Nice. In diagram D , you see two nuclei in a cell that’s about to divide.
HINT FOR NEXT TIME: Find two nuclei in a cell that’s about to divide.
Chromosomes are lined up on the middle of the cell, about to be pulled apart.
Awesome. That’s what happens during metaphase, as shown in diagram “F.”
HINT FOR NEXT TIME: You’re looking for metaphase. Which diagram shows the chromosomes lined up in the middle?
[q json=”true” hotspot_user_interaction=”label_prompt” dataset_id=”mitosis-and-cell-cycle-click-on-challenge|ce14f9551ffae” question_number=”8″ unit=”4.Cell_Communication,_Cell_Cycle,_Feedback” topic=”4.6.Cell_Cycle” show_hotspots=””] Cell Division Basics: Click on the cells.
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Parent cell with unduplicated chromosomes.
Way to go! The cell before arrow “1” is the parent cell with unduplicated chromosomes.
HINT FOR NEXT TIME: In cell division there’s only one parent. Find a parent cell with chromosomes that havent been duplicated into two sister chromatids.
Parent cell with duplicated chromosomes
Way to go. The cell between arrows 1 and 2 is the parent cell, but with duplicated chromosomes.
HINT FOR NEXT TIME: Arrow “1” represents DNA replication. After DNA replication, chromosomes have been duplicated.
Each doubled chromosome, with two sister chromatids, is about to be pulled apart.
Great. It’s the cell between “2” and “3”
HINT FOR NEXT TIME: Find a cell where doubled chromosomes, with two sister chromatids, are close to the middle of the cell, attached to spindle fibers.
Sister chromatids are being pulled apart to opposite ends of the cell.
Terrific! It’s the cell between “3” and “4.”
HINT FOR NEXT TIME: Find a cell where the sister chromatids (doubled chromosomes) have been separated.
The daughter cells.
Nice! Those cells after arrow 4 are the daughter cells.
HINT FOR NEXT TIME: Find the cells at the end of the process. Those are the daughter cells.
[q json=”true” hotspot_user_interaction=”label_prompt” dataset_id=”mitosis-and-cell-cycle-click-on-challenge|1a20abccf1d1c8″ question_number=”9″ unit=”4.Cell_Communication,_Cell_Cycle,_Feedback” topic=”4.6.Cell_Cycle” show_hotspots=””] Cell Division Basics: Click on the arrows.
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The arrow for DNA replication
Yes! Arrow “1” is DNA replication.
HINT FOR NEXT TIME: Find the arrow that shows single chromosomes becoming doubled chromosomes, with two sister chromatids.
The arrow for Cytokinesis
Awesome. The arrow at “4” is cytokinesis.
HINT FOR NEXT TIME: Cytokinesis is when one cell splits apart into two.
The arrow for Anaphase
Nice. Arrow “3” shows anaphase.
HINT FOR NEXT TIME: During anaphase, sister chromatids are pulled apart.
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