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<h2 class="hd hd-2 unit-title">Reference Summary</h2>
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<h3><b> Mitosis </b></h3>
<p> <b>Mitosis</b> is the process of cell division by which 2 daughter cells are produced from 1 mother cell. <br /> The daughter cells have the same ploidy and are genetically identical to both each other and the mother cell. </p>
<img src='/assets/courseware/v1/cfa9db37b42d0501fba285d79cfeb599/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/k1.png' alt="This diagram depicts the process of mitosis in which a cell with a pair of homologous chromosomes replicates. First, there is a cell, represented as a circle, that has two chromosomes. These chromosomes are each represented as a line in the cell. One chromosome is labelled A 1 and the other is labeled A 2. Then, an arrow labelled D N A replication points from this first cell diagram to a second cell diagram. This second circle contains four lines that represent the two copies of the two original chromosomes. The two lines labelled A 1 are paired and the other two lines labelled A 2 are paired. There are two additional cells that are drawn with an addition sign in between them. There are two arrows that stem from the second cell diagram, and each one points to one of these addtitional cells to indicate that the cell has divided into two new cells. The two new cells are identical with each other and the first diagram of the original cell in that they contain one A 1 chromosome and one A 2 chromosome. That is to say that each daughter cell is diploid and identical to the mother cell.">
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<h3><b> Meiosis </b></h3>
<p> <b>Meiosis</b> is the process of cell division by which 4 gametes are produced from 1 mother cell. <br /> The gametes' ploidies are half of the mother cell's ploidy. The gametes are <b>NOT</b> genetically identical to each other <b> NOR </b> to the mother cell. </p>
<p> <b> Gametes </b> are cells with half of the normal ploidy (haploid for humans). Examples of gametes are eggs (ova) and sperm cells. </p> <br />
<img src='/assets/courseware/v1/7b6690d67983c2be4e40c31d95a5ea33/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/k1_1.png' alt="This diagram depicts a cell with a pair of homologous chromosomes undergoing meiosis. First, there is a cell, represented as a circle, that has two chromosomes. These chromosomes are each represented as a line in the cell. One chromosome is labelled A 1 and the other is labeled A 2. Then, an arrow labelled D N A replication points from this first cell diagram to a second cell diagram. This second circle contains four lines that represent the two copies of the two original chromosomes. The two lines labelled A 1 are paired and the other two lines labelled A 2 are paired. There are two arrows that stem from the second cell diagram, and each one points to a new cell to indicate that the original cell has divide into two new cells. In this step, known as Meiosis I, the homologous chromosomes separate. Therefore, one of these new cells contains the two paired A 1 chromosomes and the other new cell contains the two paired A 2 chromosomes. The next step is labelled Meiosis II and is when sister chromatids separate. Each of the two cells produced from Meiosis I divides to produce two new cells. Each of these new cells contains one copy of one chromosome. Therefore, a total of four cells are produced. Two of these product cells have a single copy of the A 1 chromosome, and two of these product cells have a single copy of the A 2 chromosome. Thus, the products of meiosis are 4 haploid gametes.">
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<h2 class="hd hd-2 unit-title">Exercise 1 (Haploid v. Diploid)</h2>
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<h2 class="hd hd-2 unit-title">Exercise 2 (Diagramming Mitosis)</h2>
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Diagramming Mitosis
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<p>The cell below has <b>a single pair of chromosomes</b>. The cell replicates its chromosomes in preparation for <b>mitosis</b>. The resulting daughter cells are each diploid and identical to the mother cell.</p>
<p><img src="/assets/courseware/v1/b4a7321c9ee1c87848f6cf905384b555/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/k3.png" width="700" style="float: center;" alt="A cell with homologous chromosomes labeled A 1 and A 2. After D N A replication, the cell contains two copies each of A 1 and A 2. Then the cell undergoes mitosis to split into 2 daughter cells, which are empty on this diagram."/></p>
<p>Complete the diagram by selecting all the icons that represent the new daughter cells.</p>
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<input type="checkbox" name="input_06012b730b51426ba749171c876e0bbb_2_1[]" id="input_06012b730b51426ba749171c876e0bbb_2_1_choice_0" class="field-input input-checkbox" value="choice_0"/><label id="06012b730b51426ba749171c876e0bbb_2_1-choice_0-label" for="input_06012b730b51426ba749171c876e0bbb_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_06012b730b51426ba749171c876e0bbb_2_1"> <img src="/assets/courseware/v1/600b22c2e783eda246b29a65ea61a4a7/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/2.5_ex2_a.png" width="200" style="float: center;" alt="A circle representing a daughter cell after mitosis. The cell contains two copies of chromosome A 1 and two copies of chromosome A 2."/>
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<input type="checkbox" name="input_06012b730b51426ba749171c876e0bbb_2_1[]" id="input_06012b730b51426ba749171c876e0bbb_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="06012b730b51426ba749171c876e0bbb_2_1-choice_1-label" for="input_06012b730b51426ba749171c876e0bbb_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_06012b730b51426ba749171c876e0bbb_2_1"> <img src="/assets/courseware/v1/63192365b4012a6d6d7c6044fb68fedc/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/2.5_ex2_b.png" width="200" style="float: center;" alt="A circle representing a daughter cell after mitosis. The cell contains one copy of chromosome A 1 and one copy of chromosome A 2."/>
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<input type="checkbox" name="input_06012b730b51426ba749171c876e0bbb_2_1[]" id="input_06012b730b51426ba749171c876e0bbb_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="06012b730b51426ba749171c876e0bbb_2_1-choice_2-label" for="input_06012b730b51426ba749171c876e0bbb_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_06012b730b51426ba749171c876e0bbb_2_1"> <img src="/assets/courseware/v1/b59ea9dc6d3e6fdf50d9621466ade9db/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/2.5_ex2_c.png" width="200" style="float: center;" alt="A circle representing a daughter cell after mitosis. The cell contains two copies of chromosome A 1."/>
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<input type="checkbox" name="input_06012b730b51426ba749171c876e0bbb_2_1[]" id="input_06012b730b51426ba749171c876e0bbb_2_1_choice_3" class="field-input input-checkbox" value="choice_3"/><label id="06012b730b51426ba749171c876e0bbb_2_1-choice_3-label" for="input_06012b730b51426ba749171c876e0bbb_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_06012b730b51426ba749171c876e0bbb_2_1"> <img src="/assets/courseware/v1/10f14d02434acd4883b293508e80a4c7/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/2.5_ex2_d.png" width="200" style="float: center;" alt="A circle representing a daughter cell after mitosis. The cell contains two copies of chromosome A 2."/>
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<p>What is the ploidy of the daughter cells? Select the best answer.</p>
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<input type="radio" name="input_06012b730b51426ba749171c876e0bbb_3_1" id="input_06012b730b51426ba749171c876e0bbb_3_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="06012b730b51426ba749171c876e0bbb_3_1-choice_0-label" for="input_06012b730b51426ba749171c876e0bbb_3_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_06012b730b51426ba749171c876e0bbb_3_1"> 1n
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<h2 class="hd hd-2 unit-title">Exercise 3 (Diagramming Meiosis)</h2>
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<p>The cell below has <b>a single pair of chromosomes</b> and undergoes <b>meiosis</b>.</p>
<p><img src="/assets/courseware/v1/a2b7075743be2f0b5efecfb01334b823/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/2.5_ex3_main.png" style="float: center;" alt="A cell with homologous chromosomes labeled A 1 and A 2. A flow chart full of empty circles indicates further steps. The cell undergoes D N A replication (labeled 1), then meiosis 1 (labeled 2 and 3), followed by meiosis 2 (labeled 4, 5, 6, and 7)." width="700" /></p>
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Diagramming Meiosis, part i
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<p>Complete the diagram by selecting all the icons that represent cell <b>1</b> (after DNA replication).</p>
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<input type="checkbox" name="input_bcaf88f57bda417c8807e85cc37ed25e_2_1[]" id="input_bcaf88f57bda417c8807e85cc37ed25e_2_1_choice_0" class="field-input input-checkbox" value="choice_0"/><label id="bcaf88f57bda417c8807e85cc37ed25e_2_1-choice_0-label" for="input_bcaf88f57bda417c8807e85cc37ed25e_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_bcaf88f57bda417c8807e85cc37ed25e_2_1"> <img src="/assets/courseware/v1/600b22c2e783eda246b29a65ea61a4a7/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/2.5_ex2_a.png" width="100" style="float: center;" alt="A circle representing a cell. The cell contains two copies of chromosome A 1 and two copies of chromosome A 2."/>
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<input type="checkbox" name="input_bcaf88f57bda417c8807e85cc37ed25e_2_1[]" id="input_bcaf88f57bda417c8807e85cc37ed25e_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="bcaf88f57bda417c8807e85cc37ed25e_2_1-choice_1-label" for="input_bcaf88f57bda417c8807e85cc37ed25e_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_bcaf88f57bda417c8807e85cc37ed25e_2_1"> <img src="/assets/courseware/v1/63192365b4012a6d6d7c6044fb68fedc/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/2.5_ex2_b.png" width="100" style="float: center;" alt="A circle representing a cell. The cell contains one copy of chromosome A 1 and one copy of chromosome A 2."/>
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<input type="checkbox" name="input_bcaf88f57bda417c8807e85cc37ed25e_2_1[]" id="input_bcaf88f57bda417c8807e85cc37ed25e_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="bcaf88f57bda417c8807e85cc37ed25e_2_1-choice_2-label" for="input_bcaf88f57bda417c8807e85cc37ed25e_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_bcaf88f57bda417c8807e85cc37ed25e_2_1"> <img src="/assets/courseware/v1/b59ea9dc6d3e6fdf50d9621466ade9db/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/2.5_ex2_c.png" width="100" style="float: center;" alt="A circle representing a cell. The cell contains two copies of chromosome A 1."/>
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<h3 class="hd hd-3 problem-header" id="04b819c9d1ed4e1a912e5b093a81442d-problem-title" aria-describedby="block-v1:OCW+Pre-7.01+1T2020+type@problem+block@04b819c9d1ed4e1a912e5b093a81442d-problem-progress" tabindex="-1">
Diagramming Meiosis, part ii
</h3>
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<p>Complete the diagram by selecting all the icons that represent cells <b>2 and 3</b> (after meiosis I).</p>
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Diagramming Meiosis, part iii
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<p>Complete the diagram by selecting all the icons that represent cells <b>4 and 5</b> (after meiosis II), assuming that <b>cell 2</b> contained chromosome A1.</p>
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<input type="checkbox" name="input_e0ff2e30f9544add965702d16e4f6f26_2_1[]" id="input_e0ff2e30f9544add965702d16e4f6f26_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="e0ff2e30f9544add965702d16e4f6f26_2_1-choice_1-label" for="input_e0ff2e30f9544add965702d16e4f6f26_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_e0ff2e30f9544add965702d16e4f6f26_2_1"> <img src="/assets/courseware/v1/63192365b4012a6d6d7c6044fb68fedc/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/2.5_ex2_b.png" width="100" style="float: center;" alt="A circle representing a cell. The cell contains one copy of chromosome A 1 and one copy of chromosome A 2."/>
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Diagramming Meiosis, part iv
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<p>Complete the diagram by selecting all the icons that represent cells <b>6 and 7</b> (after meiosis II), assuming that <b>cell 3</b> contained chromosome A2.</p>
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Diagramming Meiosis, part v
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<p>What is the ploidy of the gametes? Select the best answer.</p>
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