Biology (Holt)

CHAPTER 6Chromosomes and Cell Reproduction 117

Quick Review Looking Ahead

Answer the following without referring to
earlier sections of your book.
1.Definethe term mutation.(Chapter 1,
Section 1)
2.Describethe structure of proteins and of DNA.
(Chapter 2, Section 3)
3.Summarizethe function and structure of the
nucleus and of microtubules. (Chapter 3,
Section 2)
Did you have difficulty? For help, review the
sections indicated.

Section 1

Chromosomes

Formation of New Cells by Cell Division

How Chromosome Number and Structure

Affect Development

Section 2

The Cell Cycle

The Life of a Eukaryotic Cell

Control of the Cell Cycle

Section 3

Mitosis and Cytokinesis

Chromatid Separation in Mitosis

Mitosis and Cytokinesis

http://www.scilinks.org

National Science Teachers Association sciLINKS Internet

resources are located throughout this chapter.

Reading Activity

Copy the following statements in your notebook:

• Chromosomes from females determine the sex
  of humans.


• Every human cell contains 46 chromosomes.


• Healthy cells cannot become cancerous cells.

Before you read the chapter, write down if
you agree with each statement. After you have
finished reading the chapter, decide whether you
still agree with your first response.

This cluster of cells is smaller than the head of a pin,
but over the next 17 days, they will divide repeatedly
to form a new mouse. Chromosomes inside each cell
carry the instructions for growth and development of
an individual.

Chromosomes

and Cell

Reproduction

CHAPTER

6

6C

9A

4A