Review questions, Nov 1

 

1. The haploid phase of the human cycle begins with ______ and the diploid phase begins with _______.
1. mitosis ....................fertilization
2. mitosis.....................meiosis
3. meiosis ...................mitosis
4. meiosis ...................fertilization
5. fertilization............meiosis

 

2. Label Figure 1 using the terms listed below.

Anaphase I                 Anaphase II                Interphase                  Metaphase I              

Metaphase II              Prophase I                 Prophase II                 Telophase I                Telophase II

 

3. At which phase the followings occur?  Use the terms listed above.
1. Tetrads are aligned at the center.
2. Chromosomes consisting of two sister chromotids are aligned at the center.
3. Two haploid cells are generated.
4. Cells duplicate their chromosomes.
5. Sister chromatids are separated from each other and now called daughter chromosomes.  Daughter chromosomes move towards the opposite poles.
6. Crossing over occurs.
7. Homologous chromosomes are separated from each other and migrate towards the opposite poles.
8. Synapsis of homologous chromosomes occurs.

 

4. An organism has a haploid chromosome number n = 4. How many tetrads will form during meiosis?
1. 2                      b. 4                  c. 6                  d. 8                  e. 10

 

5. Mitosis and cytokinesis result in the formation of ______; meiosis and cytokinesis result in the formation of ________.

 

1. four diploid cells............two haploid cells
2. two diploid cells ............four haploid cells
3. two haploid cells............four diploid cells
4. four haploid cells...........two diploid cells

 

6. Sexual reproduction contribute to ________.
1. greater a risk of mutations
2. lower chance of species survival
3. increase in genetic variation
4. decrease in genetic variation

 

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Figure 1