1. Active Reading: “Themes of Biology”
Ch. 1: “Biology and You”
Active Reading: “Themes of Biology”

2. SKILL: READING EFFECTIVELY
1. Why does the word traits appear in parentheses in Sentence 1?
A: It is a synonym for characteristics that directly precede it.
2. The word genes appears in boldface type in Sentence 2. What does the use of boldface type indicate?
A: It shows that it is a Key Term, or important word, that is defined in the sentence.
3. Based on Sentence 3, how would you define the word heredity?
A: Heredity is the passing of traits from parents to offspring.

3. SKILL: RECOGNIZING CAUSE AND EFFECT
4. A cause-and-effect relationship is identified in Sentence 4. What is the effect of heredity?
A: It is that children tend to resemble their parents.
5. Another cause-and-effect relationship is identified in Sentence 5. What causes genes to change?
A: Damage to genes causes change.

4. SKILL: RECOGNIZING CAUSE AND EFFECT
6. What relationship is indicated by the parentheses in Sentence 7?
A: The relationship indicated is that an egg and sperm are types of sex cells.
7. Sentence 8 describes two cause-and-effect relationships. What are they?
A: Mutations in body cells cause disruption in the control of cell reproduction, and disruption in the control of cell reproduction causes cancer.

5. Multiple Choice 8. A change in the DNA of a gene is called a ___
a. cancer.
b. trait.
c. mutation.
d. sex cell.
Answer: c