Cell division occurs through two main processes: mitosis and meiosis. Mitosis produces two identical daughter cells from one parent cell during growth and tissue repair. Meiosis produces gametes with half the number of chromosomes from a single cell for sexual reproduction. The cell cycle consists of interphase, where the cell grows and duplicates its DNA, and either mitosis or meiosis, where the genetic material divides. During mitosis, the duplicated chromosomes align and separate into two identical daughter cells.
-Cell Division Process In Prokaryotes & Eukaryotes
-Compacting DNA into Chromosomes
-Types of Cell Reproduction
-Phases of the Cell Cycle
-Mitosis
-Meiosis
-Oogenesis & Spermatogenesis
-Comparison of Divisions
Chapter-6Cell Cycle and DivisionCell Divisio.docxchristinemaritza
Chapter-6
Cell Cycle and Division
Cell Division
Cells reproduce by cell division, in which a parent cell normally gives rise to two daughter cells
Each daughter cell receives a complete set of hereditary information (DNA) from the parent cell and about half its cytoplasm
The hereditary information DNA is usually identical with that of the parent cell
The cell division of eukaryotic cells by which organisms grow or increase in number is called mitotic cell division
After cell division, the daughter cells may differentiate, becoming specialized for specific functions
The repeating pattern of divide, grow, and differentiate, then divide again is called the cell cycle
Most multicellular organisms have three categories of cells
1. stem cells
2. Other cells capable of dividing
3. Permanently differentiated cells
1.Stem cells :
- have two important characteristics: self-renewal, and the ability to differentiate into a variety of cell types
-Stem cells self-renew because they retain the ability to divide, perhaps for the entire life of the organism
-Some stem cells in early embryos can produce any of the specialized cell types of the entire body
2. Other cells capable of dividing
-Some cells other than stem cells are capable of continuing to divide, but typically differentiate into only one or two different cell types
-Dividing liver cells, for example, can only become more liver cells
3. Permanently differentiated cells
-Permanently differentiated cells differentiate and never divide again
-For example, most heart and brain cells cannot divide
CELL CYCLE
Both prokaryotic and eukaryotic cells have cell cycles that include growth, metabolic activity, DNA replication, and cell division
However, they have major structural and functional differences
Eukaryotic chromosome
Eukaryotic chromosomes are separated from the cytoplasm by a membrane-bound nucleus
Eukaryotic cells always have multiple chromosomes
Eukaryotic chromosomes are longer and have more DNA than prokaryotic chromosomes (human chromosomes are 10 to 80 times longer and have 10 to 50 times more DNA)
Genes
Genes are segments of the DNA of a chromosome
Genes are sequences of DNA from hundreds to thousands of nucleotides long
Each gene occupies a specific place, or locus (plural, loci) on the chromosome
Two important parts of chromosome
Two telomeres
One centromere
It temporarily holds two daughter DNA double helices together after DNA replication
It is the attachment site for microtubules that move the chromosomes during cell division
Homologous
11
Chromosomes that contain the same genes are called homologous chromosomes, or homologues
Cells with pairs of homologous chromosomes are called diploid, which means “double”
Cells with half the number of chromosomes are called haploid
Human Chromosomes
A typical human cell has ...
-Cell Division Process In Prokaryotes & Eukaryotes
-Compacting DNA into Chromosomes
-Types of Cell Reproduction
-Phases of the Cell Cycle
-Mitosis
-Meiosis
-Oogenesis & Spermatogenesis
-Comparison of Divisions
Chapter-6Cell Cycle and DivisionCell Divisio.docxchristinemaritza
Chapter-6
Cell Cycle and Division
Cell Division
Cells reproduce by cell division, in which a parent cell normally gives rise to two daughter cells
Each daughter cell receives a complete set of hereditary information (DNA) from the parent cell and about half its cytoplasm
The hereditary information DNA is usually identical with that of the parent cell
The cell division of eukaryotic cells by which organisms grow or increase in number is called mitotic cell division
After cell division, the daughter cells may differentiate, becoming specialized for specific functions
The repeating pattern of divide, grow, and differentiate, then divide again is called the cell cycle
Most multicellular organisms have three categories of cells
1. stem cells
2. Other cells capable of dividing
3. Permanently differentiated cells
1.Stem cells :
- have two important characteristics: self-renewal, and the ability to differentiate into a variety of cell types
-Stem cells self-renew because they retain the ability to divide, perhaps for the entire life of the organism
-Some stem cells in early embryos can produce any of the specialized cell types of the entire body
2. Other cells capable of dividing
-Some cells other than stem cells are capable of continuing to divide, but typically differentiate into only one or two different cell types
-Dividing liver cells, for example, can only become more liver cells
3. Permanently differentiated cells
-Permanently differentiated cells differentiate and never divide again
-For example, most heart and brain cells cannot divide
CELL CYCLE
Both prokaryotic and eukaryotic cells have cell cycles that include growth, metabolic activity, DNA replication, and cell division
However, they have major structural and functional differences
Eukaryotic chromosome
Eukaryotic chromosomes are separated from the cytoplasm by a membrane-bound nucleus
Eukaryotic cells always have multiple chromosomes
Eukaryotic chromosomes are longer and have more DNA than prokaryotic chromosomes (human chromosomes are 10 to 80 times longer and have 10 to 50 times more DNA)
Genes
Genes are segments of the DNA of a chromosome
Genes are sequences of DNA from hundreds to thousands of nucleotides long
Each gene occupies a specific place, or locus (plural, loci) on the chromosome
Two important parts of chromosome
Two telomeres
One centromere
It temporarily holds two daughter DNA double helices together after DNA replication
It is the attachment site for microtubules that move the chromosomes during cell division
Homologous
11
Chromosomes that contain the same genes are called homologous chromosomes, or homologues
Cells with pairs of homologous chromosomes are called diploid, which means “double”
Cells with half the number of chromosomes are called haploid
Human Chromosomes
A typical human cell has ...
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Length: 30 minutes
Session Overview
-------------------------------------------
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