Name: Date: 12/12/2020
Student Exploration: Meiosis
Directions: Follow the instructions to go through the simulation. Respond to the questions and
prompts in the orange boxes.
Vocabulary: anaphase, chromosome, crossover, cytokinesis, diploid, DNA, dominant, gamete, genotype,
germ cell, haploid, homologous chromosomes, interphase, meiosis, metaphase, mitosis, ovum, phenotype,
prophase, recessive, sister chromatid, sperm cell, telophase, zygote
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
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?
The daughter cells must make a copy of every chromosomes
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?
each must have 23 chromosomes
Gizmo Warm-up
Meiosis is a type of cell division that 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 will learn the steps in
meiosis and experiment to produce customized sex cells and offspring.
On the STEPS tab, click Male. You are looking at a germ cell, or a cell
that will undergo meiosis to become gametes.
1. Read the description of interphase at the bottom of the Gizmo. What happens to the cell at the beginning
of interphase?
mRna and protein is synthesized
2. Click on the DNA in the nucleus of the cell. Describe what happens.
DNA gets copied and cell grows
3. Why is it necessary for the cell to grow and duplicate its DNA before the start of meiosis?
Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved
, Because there needs to be 2 DNAs, one to be kept for the parent cell and the other to
be sent to the daughter cell
Get the Gizmo ready:
Activity A:
● Make sure the STEPS tab is selected.
Steps in meiosis ● If necessary, choose the Male cell. Click on the
DNA to copy it to proceed to prophase I.
Introduction: Unlike mitosis, which produces two identical daughter cells from one parent cell, meiosis creates
four unique daughter cells with half the amount of DNA as the parent cell.
Question: How does meiosis create four daughter cells from one parent cell?
1. Observe: (Prophase I) 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? 4 pairs
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). Click the image to select
EDIT to use the drawing tool.
In the Gizmo, drag the homologous chromosomes together.
Click Continue.
2. Observe: (Metaphase I and Anaphase I) - 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 I?
Sister chromatids are pulled to each side
3. Compare: An image of the anaphase step in mitosis is shown to the right.
A. How does anaphase I in meiosis mitosis broke down the
differ from anaphase in mitosis? chromosomes. in meiosis
the chromatids are not
separated but they are
pulled apart as they are still
joined.
B. At the end of anaphase I (meiosis), how many 2
chromosomes are on each side?
Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved
Student Exploration: Meiosis
Directions: Follow the instructions to go through the simulation. Respond to the questions and
prompts in the orange boxes.
Vocabulary: anaphase, chromosome, crossover, cytokinesis, diploid, DNA, dominant, gamete, genotype,
germ cell, haploid, homologous chromosomes, interphase, meiosis, metaphase, mitosis, ovum, phenotype,
prophase, recessive, sister chromatid, sperm cell, telophase, zygote
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
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?
The daughter cells must make a copy of every chromosomes
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?
each must have 23 chromosomes
Gizmo Warm-up
Meiosis is a type of cell division that 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 will learn the steps in
meiosis and experiment to produce customized sex cells and offspring.
On the STEPS tab, click Male. You are looking at a germ cell, or a cell
that will undergo meiosis to become gametes.
1. Read the description of interphase at the bottom of the Gizmo. What happens to the cell at the beginning
of interphase?
mRna and protein is synthesized
2. Click on the DNA in the nucleus of the cell. Describe what happens.
DNA gets copied and cell grows
3. Why is it necessary for the cell to grow and duplicate its DNA before the start of meiosis?
Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved
, Because there needs to be 2 DNAs, one to be kept for the parent cell and the other to
be sent to the daughter cell
Get the Gizmo ready:
Activity A:
● Make sure the STEPS tab is selected.
Steps in meiosis ● If necessary, choose the Male cell. Click on the
DNA to copy it to proceed to prophase I.
Introduction: Unlike mitosis, which produces two identical daughter cells from one parent cell, meiosis creates
four unique daughter cells with half the amount of DNA as the parent cell.
Question: How does meiosis create four daughter cells from one parent cell?
1. Observe: (Prophase I) 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? 4 pairs
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). Click the image to select
EDIT to use the drawing tool.
In the Gizmo, drag the homologous chromosomes together.
Click Continue.
2. Observe: (Metaphase I and Anaphase I) - 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 I?
Sister chromatids are pulled to each side
3. Compare: An image of the anaphase step in mitosis is shown to the right.
A. How does anaphase I in meiosis mitosis broke down the
differ from anaphase in mitosis? chromosomes. in meiosis
the chromatids are not
separated but they are
pulled apart as they are still
joined.
B. At the end of anaphase I (meiosis), how many 2
chromosomes are on each side?
Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved
