Chapter 11: The Continuity of Life: Cellular Reproduction
[Pages:37]Chapter 11: The Continuity of Life: Cellular Reproduction
Chapter 11: Cellular Reproduction
What is Cellular Reproduction?
Answer: The division of a parent cell into two daughter cells
Requirements of Each Daughter Cell: 1) Necessary genomic information (DNA) 2) A complete assortment of cytoplasmic materials
Cell Types Differ in Reproductive Process: ? Prokaryotes = Binary Fission
Chapter 11: Cellular Reproduction
Binary Fission - "splitting in two" ? Prokaryote DNA:
? Single circular chromosome ? Attached to cell wall Steps in Binary Fission: 1) Chromosome replicates 2) Cell elongates (membrane production) ? Chromosomes pulled apart 3) Membrane pinches in middle 4) Daughter cells formed
(Figure 11.1)
Chapter 11: Cellular Reproduction
What is Cellular Reproduction?
Answer: The division of a parent cell into two daughter cells
Cell Types Differ in Reproductive Process: ? Prokaryotes = Binary Fission ? Eukaryotes:
1) Mitosis: Daughter cells genetically identical to parent cells
Functions:
? Growth (We all start as a single cell...) ? Maintenance (Skin flakes off...) ? Repair (Wounds heal...) ? Asexual reproduction (produces clone of parent)
Chapter 11: Cellular Reproduction
Mitosis: Cell Cycle: The cell activity from one cell division to the next
Interphase (majority of time): 1) G1 Phase (growth phase 1)
? Acquire materials ? Grow 2) S Phase (synthesis phase) ? Replicate DNA 3) G2 Phase (growth phase 2) ? Synthesize material
for cell division
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