Concepts of Biology
Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
bartleby

Concept explainers

bartleby

Videos

Textbook Question
Book Icon
Chapter 6, Problem 1ACQ

Figure 6.4 Which of the following is the correct order of events in mitosis?

a. Sister chromatids line up at the metaphase plate. The kinetochore becomes attached to the initotic spindle. The nucleus re-forms and the cell divides. The sister chromatids separate.

b. The kinetochore becomes attached to the mitotic spindle. The sister chromatids separate. Sister chromatids line up at the metaphase plate. The nucleus re-forms and the cell divides.

c. The kinetochore becomes attached to metaphase plate. Sister chromatids line up at the metaphase plate. The kinetochore breaks down and the sister chromatids separate. The nucleus re-forms and the cell divides.

d. The kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the

metaphase plate. The kinetochore breaks apart and the sister chromatids separate. The nucleus re-forms and the cell divides.

Chapter 6, Problem 1ACQ, Figure 6.4 Which of the following is the correct order of events in mitosis? a. Sister chromatids

Expert Solution & Answer
Check Mark
Summary Introduction

Introduction:

The mitosis is the process of the cell division, which takes place in all the somatic cells present in the body of a multicellular organism. The mitosis is divided into four phases, i.e., prophase, metaphase, anaphase and telophase.

In the prophase stage, the genetic material condenses to form the chromatids. These chromatids get lined up at the equator or the metaphase plate during metaphase and the spindle fibers bind to the kinetochore present at the center of the sister chromatids. In anaphase, the sister chromatids are pulled to the opposite poles, and in telophase, the chromatids are decondensed and nuclear envelope is formed which results in two nuclei in the dividing cell.

Answer to Problem 1ACQ

Correct answer:

The correct answer is option (d) − the kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the metaphase plate. Cohesin proteins break down and the sister chromatids separate. The nucleus reforms and the cell divides.

Explanation of Solution

Explanation/justification for the correct answer:

Option (d): During early metaphase, the kinetochore attaches to the spindle fibers. The sister chromatids of the dividing cells line up at the metaphase plate. After the alignment, the spindle fibers attach to the kinetochore. The sister chromatids are bound together with the help of cohesin. After the alignment of the sister chromatids at the metaphase plate, the cohesin breaks and the sister chromatid separate and move to the opposite poles. A nucleus is formed on each opposite pole and then the cytoplasmic division results in the formation of two new cells.

Explanation for the incorrect answer:

Option (a): In this option, the separation of sister chromatids is placed after the formation of a nucleus, but the formation of the nucleus takes place after the sister chromatids are separated and move to opposite poles. So, it is an incorrect option.

Option (b): In this option, the separation of the sister chromatids is placed before the lining of sister chromatids on the metaphase plate. The cohesin protein breaks after the sister chromatids are lined up on the metaphase plate, which causes the breaking of sister chromatids. So, it is an incorrect option.

Option (c): In this option, it is said that the kinetochore is attached to the cohesin protein, but the kinetochore actually gets attached to the spindle fibers. So, it is an incorrect answer.

Conclusion

During metaphase, the mitotic spindle binds to the kinetochore and causes the alignment of sister chromatids on metaphase plate and the cohesin breaks which results in separation of the sister chromatids. The sister chromatids are then pulled to the opposite pole, where the new nucleus is formed followed by cytokinesis. In this way the two new cells from one existing cell are formed. Hence, option (d) is the correct answer.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
06:29
Students have asked these similar questions
Figure 6.4 Which of the following is the correct order of events in mitosis?a. Sister chromatids line up at the metaphase plate. The kinetochore becomes attached to the mitotic spindle. The nucleus re-forms and the cell divides. The sister chromatids separate.b. The kinetochore becomes attached to the mitotic spindle. The sister chromatids separate. Sister chromatids line up at the metaphase plate. The nucleus re-forms and the cell divides.c. The kinetochore becomes attached to metaphase plate. Sister chromatids line up at the metaphase plate. The kinetochore breaks down and the sister chromatids separate. The nucleus re-forms and the cell divides.d. The kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the metaphase plate. The kinetochore breaks apart and the sister chromatids separate. The nucleus re-forms and the cell divides.
Which of the following is the correct order of events in mitosis?   1. Sister chromatids line up at the metaphase plate. The kinetochore becomes attached to the mitotic spindle. The nucleus re-forms and the cell divides. The sister chromatids separate.   2. The kinetochore becomes attached to the mitotic spindle. The sister chromatids separate. Sister chromatids line up at the metaphase plate. The nucleus re-forms and the cell divides.   3. The kinetochore becomes attached to metaphase plate. Sister chromatids line up at the metaphase plate. The kinetochore breaks down and the sister chromatids separate. The nucleus re-forms and the cell divides.   4. The kinetochore becomes attached to the mitotic spindle. Sister chromatids line up at the metaphase plate. The kinetochore breaks apart and the sister chromatids separate. The nucleus re-forms and the cell divides.
Which of the following is the correct order of events in mitosis? (Arrange accordingly)   Sister chromatids line up at the metaphase The kinetochore becomes attached to the mitotic spindle. The nucleus reforms and the cell divides. Cohesin proteins break down and the sister chromatids separate. The kinetochore becomes attached to the mitotic Cohesin proteins break down and the sister chromatids separate. Sister chromatids line up at the metaphase plate. The nucleus reforms and the cell divides. The kinetochore becomes attached to the cohesin Sister chromatids line up at the metaphase plate. The kinetochore breaks down and the sister chromatids separate. The nucleus reforms and the cell divides. The kinetochore becomes attached to the mitotic Sister chromatids line up at the metaphase plate. Cohesin proteins break down and the sister chromatids separate. The nucleus reforms and the cell divides. Chemotherapy drugs such as vincristine and colchicine disrupt mitosis by binding to…
Knowledge Booster
Background pattern image
Biology
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Text book image
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
Text book image
Human Heredity: Principles and Issues (MindTap Co...
Biology
ISBN:9781305251052
Author:Michael Cummings
Publisher:Cengage Learning
Text book image
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Biology
ISBN:9781305967359
Author:STARR
Publisher:CENGAGE L
Text book image
Human Biology (MindTap Course List)
Biology
ISBN:9781305112100
Author:Cecie Starr, Beverly McMillan
Publisher:Cengage Learning
The Cell Cycle and its Regulation; Author: Professor Dave Explains;https://www.youtube.com/watch?v=eqJqhA8HSJ0;License: Standard YouTube License, CC-BY
Cell Division - Mitosis and Meiosis - GCSE Biology (9-1); Author: Mr Exham Biology;https://www.youtube.com/watch?v=w7vp_uRA8kw;License: Standard YouTube License, CC-BY