1. Comparing Mitosis and Meiosis
CELL CYCLE
Comparing Mitosis and Meiosis

2. Similarities Both are forms of cell division
Both involve similar steps—prophase, metaphase, anaphase, telophase
Both involve chromosome replication
Both are followed by cytokinesis

3. Differences
Meiosis reduces the number of chromosomes in the daughter cells by half while mitosis maintains the same number of chromosomes
Meiosis creates daughter cells that are unique while mitosis creates daughter cells that are genetically identical
Meiosis results in 4 cells while mitosis results in only 2 cells
Meiosis occurs in the reproductive organs to produce sex cells while mitosis occurs in the other body organs to produce somatic cells

4. Variation
Variation is defined as the differences between members of a population
Occurs during meiosis by the random separation of homologous chromosomes
Occurs during fertilization by the random combination of haploid gametes

5. Variation Variation is the key to survival!
If an environmental change occurs, a genetically diverse population has a better chance of survival

6. Comparison of Divisions
Mitosis
Meiosis
Number of divisions 1 2
Number of daughter cells 4
Genetically identical?
Yes No
Chromosome #
Same as parent
Half of parent
Where
Somatic cells
Germ (sex) cells
When
Throughout life
At sexual maturity
Role
Growth and repair
Sexual reproduction