Ch. 2 Sec. 1 Active_Reading

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Name ______________________________ Class ___________________ Date __________________

Skills Worksheet

Active Reading

Section: Health in the 21

st

Century

Read the passage below. Notice that the sentences are numbered. Answer the questions that follow.

1

All living things are able to pass on their characteristics (traits) to their offspring because the genes that determine their characteristics are passed on from parent to offspring each generation.

2

Genes

are sets of inherited instructions for making proteins that are coded in a molecule called deoxyribonucleic acid

(DNA).

3

The passing of traits from parents to offspring is called

heredity.

4 parents.

5

Heredity is the reason children tend to resemble their

Sometimes genes are the cause of physical abnormalities and serious diseases.

6

Through the science of

genetics,

researchers have been able to understand the causes of many of these conditions in humans.

7

Now that genetics researchers know how to read the complete set of genetic instructions (genome) for humans, the potential for developing treatments for genetic diseases has greatly increased.

SKILL: READING EFFECTIVELY

Read each question, and write your answer in the space provided.

1. Why does the word

traits

appear in parentheses in Sentence 1?

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

2. The word

genes

appears in boldface type in Sentence 2. What does the use of boldface type indicate?

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

3. Based on Sentence 3, how would you define the word

heredity

?

_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Biology 5 Applications of Biology

Name ______________________________ Class ___________________ Date __________________

Active Reading

continued

4. In Sentence 6, to what do the words

these conditions

refer?

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_______________________________________________________________

SKILL: RECOGNIZING CAUSE AND EFFECT

Read each question, and write your answer in the space provided.

5. A cause-and-effect relationship is identified in Sentence 4. What is the effect of heredity?

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_______________________________________________________________

6. Another cause-and-effect relationship is identified in Sentence 5. What does the word

sometimes

indicate about the “cause” in this relationship?

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_______________________________________________________________

7. Sentence 7 describes another cause-and-effect relationship. Summarize this relationship.

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_______________________________________________________________

_______________________________________________________________

_______________________________________________________________

In the space provided, write the letter of the term that best completes the statement.

_____ 8. Genes are instructions for making

a. humans.

b. genomes.

c. proteins.

d. diseases.

Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Holt Biology 6 Applications of Biology

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