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5.1 Cell Increase and Decrease
During the lifetime of an individual, mitosis causes somatic cells to increase in number and apoptosis causes them to decrease in number.

Mitosis is part of the cell cycle. Specific events must take place for mitosis to occur.		 1. What is apoptosis and what is its function?
Answer

2. What three checkpoints help control the cell cycle?
Answer		Essential Study Partner
Cell Division Introduction
Chromosomes

Art Quizzes
Cell Cycle
Mechanisms of Cell Cycle Control
Nucleosomes

Explorations
Mitosis: Regulating the Cell Cycle
5.2 Maintaining the Chromosome Number
Each species has a characteristic number of chromosomes.

Mitosis (a type of nuclear division) maintains the chromosome number in cells.

Mitosis is necessary to the growth and repair of body cells.		 3. What is the overall purpose of mitosis?
Answer

4. What is cytokinesis?
Answer		Essential Study Partner
Mitosis/Cell Cycle

Animation Quiz
Mitosis

Study Guide
Mitosis and Cytokinesis

Labeling Exercises
Mitosis Overview 1 (34.0K)
Mitosis Overview 2 (45.0K)
Plant Cell Mitosis (39.0K)
5.3 Reducing the Chromosome Number
Meiosis (another type of nuclear division) reduces the chromosome number in life cycles involving sexual reproduction.

Meiosis produces cells that have half the total number of chromosomes as the parental cell had.

Meiosis produces cells that have different combinations of genes.		 5. Name two ways that genetic recombination can occur during the process of meiosis.
Answer

6. In general, how does meiosis I differ from meiosis II?
Answer		Essential Study Partner
Meiosis
Recombination

Animation Quiz
Meiosis

Study Guide
Meiosis

Explorations
Exploring Meiosis: Down Syndrome

Labeling Exercises
Meiosis I (29.0K)
5.4 Comparison of Mitosis and Meiosis
Meiosis differs from mitosis both in occurrence and in process.		 7. Where in the body of a multicellular organism are meiosis and mitosis likely to occur?
Answer		Essential Study Partner
Review of Cell Division

Art Quiz
Alternation of Generations
5.5 The Human Life Cycle
The human life cycle includes both mitosis and meiosis.

In humans, and many other animals, meiosis is a part of the production of sperm in males and eggs in females.

When the sperm fertilizes the egg, the full number of chromosomes is restored in offspring.		 8. What occurs during spermatogenesis and oogenesis?
Answer

9. What is the function of polar bodies during oogenesis?
Answer		Labeling Exercise
Sperm and Egg Anatomy (27.0K)





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