Biology (Holt)

CHAPTER 8Mendel and Heredity 161

Quick Review Looking Ahead

Answer the following without referring to
earlier sections of your book.
1.Definethe term gamete. (Chapter 6, Section 1)
2.Summarizethe relationship between chromo-
somes and genes. (Chapter 6, Section 1)
3.Differentiatebetween autosomes and
sex chromosomes. (Chapter 6, Section 1)
4.Describehow independent assortment
during meiosis contributes to genetic
variation. (Chapter 7, Section 1)
Did you have difficulty? For help, review the
chapters indicated.

Section 1

The Origins of Genetics

Mendel’s Studies of Traits

Traits Expressed as Simple Ratios

Section 2

Mendel’s Theory

A Theory of Heredity

The Laws of Heredity

Section 3

Studying Heredity

Punnet Squares

Outcomes of Crosses

Inheritance of Traits

Section 4

Complex Patterns of Heredity

Complex Control of Traits

Genetic Disorders

http://www.scilinks.org

National Science Teachers Association sciLINKS Internet

resources are located throughout this chapter.

Reading Activity

Before you read this chapter, write a short list of
all the things you know about inheritance. Then
write a list of the things that you want to know
about inheritance. Save your list, and to assess
what you have learned, see how many questions
you can answer after reading this chapter.

Horses like this show jumper are bred for certain
traits, such as speed and agility. Most traits are inher-
ited—passed down from parents to offspring.

Mendel and

Heredity

CHAPTER

8

4A

6A

6D 6E