Textbook Notes (363,502)
Canada (158,383)
Biology (1,137)
Chapter 8

Biology Notes - Chapter 8

2 Pages
Unlock Document

Western University
Biology 1201A
Richard Gardiner

Biology Notes Chapter 8 Cell Cycles, Mitosis P. 161-162, 164-177 8.1 The Cycle of Cell Growth and Division: An Overview - In mitotic cell division, DNA replication is followed by the equal separation - that is, segregation - of the replicated DNA molecules and their delivery to the daughter cells. - The process ensures that the two cell products of a division have the same genetic information as the parent cell entering division. - Mitosis is the basis for growth and maintenance of body mass in multi-celled eukaryotes and for the reproduction of many single celled eukaryotes. - The chromosomes of eukaryotic cells are individual, linear DNA molecules with associated proteins. - DNA replication and the duplication of chromosomal proteins convert each chromosome into a structure composed of two exact copies known as sister chromatids. 8.2 The Cell Cycle in Prokaryotic Organisms: - Prokaryotic cells undergo a cycle of binary fission involving coordinated cytoplasmic growth, DNA replication and cell division, producing two daughter cells from an original parent cell. - Replication of the bacterial chromosome consumes most of the time in the cell cycle and begins at a single site called the origin, through reactions catalyzed by enzymes located in the middle of the cell. - Once the origin of replication is duplicated, the two origins actively migrate to the two ends of the cell. - Division of the cytoplasm then occurs through a partition of cell wall material that grows inward until the cell is separated into two parts. 8.3 Mitosis and The Eukaryotic Cell Cycle: - Mitosis and interphase constitute the mitotic cell cycle. - Mitosis occurs in 5 stages. 1) In prophase, (stage 1) the chromosomes condense into short rods and the spindle forms in the cytoplasm. 2) In prometaphase, (stage 2) the nuclear envelope breaks down the spindle, enters the former nuclear area, and the sister chromatids of each chromosome make connections to opposite spindle poles. Each chromatid has a kinetochore that attaches to spindle microtubules. 3) In metaphase, (stage 3), the spindle is fully formed and the chromosomes, moved by the spindle m
More Less

Related notes for Biology 1201A

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.