View the animation below, then complete the quiz to test your knowledge of the concept.
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1 | According to the Holliday model, the first step of recombination involves a nick in |
![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | only one DNA strand of each of the two homologous chromosomes. |
![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | only one DNA strand of only one of the two homologous chromosomes. |
![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | both DNA strands of each of the two homologous chromosomes. |
![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | both DNA strands of only one of the two homologous chromosomes. |
![](/olcweb/styles/shared/spacer.gif) | E)![](/olcweb/styles/shared/spacer.gif) | either one or both strands of each of the two homologous chromosomes. |
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2 | Arrange the following in the proper order in which they occur during recombination.
1. Holliday junction formation
2. Strand invasion
3. Branch migration |
![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | 1, 2, 3 |
![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | 2, 1, 3 |
![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | 2, 3, 1 |
![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | 3, 2, 1 |
![](/olcweb/styles/shared/spacer.gif) | E)![](/olcweb/styles/shared/spacer.gif) | 3, 1, 2 |
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3 | After isomerization, cleavage by an endonuclease results in |
![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | two nonrecombinant chromosomes, each containing a heteroduplex region. |
![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | two nonrecombinant chromosomes, without heteroduplex regions. |
![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | two recombinant chromosomes, each containing a heteroduplex region. |
![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | two recombinant chromosomes, without heteroduplex regions. |
![](/olcweb/styles/shared/spacer.gif) | E)![](/olcweb/styles/shared/spacer.gif) | two chromosomes that are unchanged from the original chromosome. |
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4 | The Holliday junction consists of a single DNA strand containing genetic material from two different chromosomes. |
![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | True |
![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | False |
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5 | The Holliday model can be used to explain crossing over in meiosis. |
![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | True |
![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | False |