Prentice Hall Biology (California)
Prentice Hall Biology (California)
1st Edition
Kenneth R. Miller, Levine
ISBN: 9780132013529
Textbook solutions

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Section 10.2: Cell Division

Exercise 1
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The main events of a cell cycle include the interphase and the mitotic phase. Interphase consists of the G1 phase, which is the stage of cell growth; the S phase, which is the stage for DNA replication; and the G2 phase, which is the preparation for cell division. After interphase, the mitotic phase (M-phase) occurs. It is the division of a parent cell into two daughter cells. M-phase includes mitosis and cytokinesis. The phases in mitosis include prophase, metaphase, anaphase, and telophase.
Result
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The main events of a cell cycle include the interphase and the mitotic phase. Interphase consists of the G1 phase, S phase, and G2 phase. After interphase, the mitotic phase (M-phase) occurs. M-phase includes mitosis and cytokinesis. The phases in mitosis include prophase, metaphase, anaphase, and telophase.
Exercise 2
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The four stages of mitosis include prophase, metaphase, anaphase, and telophase.

In prophase, the chromatin starts to condense and forms chromosomes. This is when the spindle starts to form and the nuclear envelope breaks down. This is considered the longest phase of mitosis.

In metaphase, the chromosomes line up in the center of the cell. Each of the chromosomes is connected to a spindle fiber.

In anaphase, the chromatids get separated and the chromosomes are moved apart.

In telophase, the chromosomes go to the opposite ends of the cell. As a result, two nuclear envelopes start to form.

Exercise 3
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Interphase, which is the stage that occurs before the cell division, consists of three phases – the G1 phase, which is the stage of cell growth; the S phase, which is the stage for DNA replication; and the G2 phase, which is the preparation for cell division. Once the cell has gone through these three phases of interphase, it is now ready for mitosis.
Exercise 4
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A chromosome is made up of deoxyribonucleic acid (DNA) that is tightly coiled around proteins which are called histones. Each chromosome consists of two chromatids that are joined together at the centromere.
Exercise 5
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Since prokaryotic cells lack a nucleus, their cell division is different from eukaryotic cells. Prokaryotes divide by simply producing the same identical copy of the original cell. This type of division is called binary fission.
Exercise 6
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**Cytokinesis** is a process in which the cytoplasm of a mitotic cell is physically divided into two daughter cells. In both plant and animal cells, cytokinesis always results in two separate cells.
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However, the manner by which the process of cytokinesis occurs is different between plant and animal cells. In animal cells, cytokinesis occurs through the formation of a *cleavage furrow* and a *contractile ring* that slowly pinches off into two separate daughter cells.
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On the other hand, plants do not form a cleavage furrow during the process of cytokinesis. Instead, cytokinesis in plants involve the formation of a *cell plate* that would eventually form a new cell wall that divides the cytoplasm of the parent cell into two daughter cells.
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