The Cell and Inheritance
11
Use pages 92-96 in Cells and Heredity for today’s lesson.
Engage/Explore:

Use craft sticks to complete the activity, “Which Chromosome Is Which” on page 92.
 Use this model to explain how chromosomes are involved in the inheritance of cells.
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Explain:

Read pages 92-96 in Prentice Hall: Science Explorer, Cells and Heredity. Complete the
graphic organizer, Chromosome Theory as you read!

What is the relationship between chromosomes and genes?
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CHROMOSOME THEORY
Number of
chromosomes
in female
grasshopper’s
body cells =
__________
Number of
chromosomes
in female
grasshopper’s
sex cells =
__________
FERTILIZATION
Number of
chromosomes
in male
grasshopper’s
body cells =
__________
Number of
chromosomes
in male
grasshopper’s
sex cells =
__________
Number of
chromosomes
in offspring’s
body cells =
__________
The Cell and Inheritance

11
State the reason why the number of body cells in the offspring is the same as the number of
body cells in each parent. Use evidence from the text to support your response.
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
Explain how the traits of an offspring from sexual reproduction are a combination of both
parents. Your response must include the following terms:
 chromosomes
 genes
 traits
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Analysis
1.
Brown eyes in dogs are dominant to any other eye color. Suppose a male boxer with hazel
eyes was bred with a female boxer with brown eyes. Determine which trait for eye color
would be the most frequent among the offspring. Use evidence from the investigation to
support your response.
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2.
Explain how sexual reproduction allows for variation within organisms. Provide an example
to support your response.
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