Meiosis Gizmo Answer Key

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Gizmo is a learning platform that will allow the students to learn math and science. Meiosis is one of the science subjects that the students will learn on Gizmo. If you want to take the Meiosis test on Gizmo and need the answer to pass the test, then you are able to find them through this page.

Meiosis Gizmo Answers

Prior Knowledge Questions

  1. During mitosis, a single cell divides to produce two daughter cells. What must happen in the original cell so that each of the daughter cells has a complete set of chromosomes?
    Answer: The DNA must replicate
  2. During sexual reproduction, two sex cells fuse to create a fertilized cell with a complete set of chromosomes. What must be true about the number of chromosomes in each sex cell?
    Answer: There must be one X and one Y or both X

Gizmo Warm up

Meiosis is a type of cell division which results in four daughter cells with half as many chromosomes as the parent cell. These daughter cells mature into gametes, or sex cells. In the meiosis Gizmo, you are going to learn the steps in meiosis and experiment to produce customized sex cells and offspring.

  1. Read the description of interphase at the bottom of the Gizmo. What happens to the cell at the beginning of interphase?
    Answer: The cell grows in size and doubles its organelles.
  2. Click on the DNA in the nucleus of the cell. Describe what happens.
    Answer: The DNA condenses into chromosomes
  3. Why is it necessary for the cell to grow and duplicate its DNA before the start of meiosis?
    Answer: It does not lose its DNA and does not lose size

Activity A: Steps in Meiosis

Question: How does meiosis create four daughter cells from one parent cell?

  1. Observe: Click on the nucleus to break it down, then click on the DNA to condense it into chromosomes. Drag the centrosomes to the top and bottom of the cell.
    A. How many chromosomes does this cell have?
    Answer: 8
    Each chromosome consists of a pair of sister chromatids, two identical strands of DNA that formed when DNA replicated during interphase.
    B. On the image to the right, draw two lines connecting the pairs of homologous chromosomes (Chromosomes of similar size with a matching set of genes). In the Gizmo, drag the homologous chromosomes together. Click Continue.
  2. Observe: Drag the groups of homologous chromosomes to the metaphase plate, then drag spindle fibers from each of the centrosomes to the chromosomes. Click the centrosome to pull the chromosomes apart. How do the chromosomes separate in Anaphase?
    Answer: They get pulled to opposite sides
  3. Compare: An image of the anaphase step in mitosis is shown to the right.
    A. How does anaphase I in meiosis differ from anaphase in mitosis?
    Answer: Anaphase I in meiosis
    B. At the end of anaphase I, how many chromosomes are on each side?
    Answer: 4
  4. Observe: Telophase I and cytokinesis are the final steps of the first half of meiosis.
    A. Describe what happens when you click on the chromosomes during telophase I.
    Answer: Chromosomes unravel and the nuclear envelope reforms around them
    B. Click and drag on the contractile ring. Describe what happened during cytokinesis.
    Answer: The structure made of actin that forms a belt around a dividing cell
  5. Observe: Go through the steps of the second half of meiosis until you reach the end of telophase II, following the instructions at the top right corner. As you proceed, answer the question below. Use the Back button if you need to see a step again.
    A. Before prophase II begins, does the DNA in the cell duplicate itself?
    Answer: No
    B. During metaphase II, do homologous chromosomes pair up as in metaphase I?
    Answer: No
    C. How does anaphase II differ from anaphase I?
    Answer: Anaphase I have chromosomes anaphase 2 has sister chromatids
    D. At the end of anaphase II, how many chromatids are on each side of the cell?
    Answer: 2
    E. After cytokinesis, how many cells have been formed from the parent cell?
    Answer: 4
    F. Are all of the cells the same size?
    Answer: yes
  6. Observe: Click on the spermatids. Spermatids that formed from meiosis will develop into mature male gametes called sperm cells. Sketch a mature sperm cell in the space to the right.

Activity B: Comparing female and male gametes

Question: What are the differences in meiosis between male and female cells?

  1. Compare: Click on the Female button. For the female cell, proceed through meiosis until you reach the end of anaphase I. Up to this point, did you notice any differences between the development of male and female gametes? Explain.
    Answer: Male meiosis takes place in the testicles but female meiosis takes place in ovories
  2. Compare: Proceed through telophase I and cytokinesis I.
    A. What do you notice about the size of the two resulting cells?
    Answer: 3 small 1 large
    B. How does this compare to the two cells at the end of telophase I and cytokinesis I in making cells?
    Answer: many cells that undergo rapid meiosis
  3. Compare: Continue through meiosis until you finish telophase II and cytokinesis II.
    A. What do you notice about the four cells now?
    Answer: All three of the cells are the same size
    B. What is the largest cell called?
    Answer: Ovum
    C. What are the small cells called?
    Answer: Polar bodies
  4. Think and discuss: Why do you think egg cells are large and sperm cells are small?
    Answer: An egg cell has to be able to create a new life while sperm cells just carry genetics

There are a few sections of the Meiosis test on Gizmo. But, in this page, we only show you the section of Warming Up, Activity A and Activity B. If you want to get a complete answer of the Meiosis test, you are able to visit this link here.

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