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Name ______________________________ Class ___________________ Date __________________
Chapter Review Heredity – Science 7
USING KEY TERMS
Use the terms from the following list to complete the sentences below. Each term maybe used only
once. Some terms may not be used.
heredity
recessive traits
phenotype
genotype
probability
pedigree
dominant traits
sex chromosomes
allele
1. In the second generation, ______________________ reappear after disappearing in the first
generation. ______________________
2. The passing of traits from parents to offspring is called ______________________.
3. An organism’s appearance is its ______________________.
4. An organism’s inherited alleles together form its ______________________.
5. If each parent has the same recessive trait, the ______________________ of the offspring
having the trait goes up.
6. To trace a trait through generations of a family, you can use a(n) ______________________.
UNDERSTANDING KEY IDEAS
Write the letter of the correct answer in the space provided.
_____ 7. What kind of plant produces offspring with the same traits as the parent?
a. self-pollinating
b. cross-pollinating
c. true-breeding
d. nonbreeding
_____ 8. What do you call one set of instructions for an inherited trait?
a. alleles
b. phenotype
c. albinism
d. genes
_____ 9. Two forms of a gene, one from each parent, are called
a. alleles.
b. phenotypes.
c. albinism.
d. genes.
_____ 10. Offspring that are different from both parents are produced by
a. asexual reproduction.
b. something going wrong.
c. sexual reproduction.
d. mitosis.
_____ 11. What are chromosomes that carry the same sets of genes?
a. twin chromosomes
b. homologous chromosomes
c. ordinary chromosomes
d. asexual chromosomes
13. What is incomplete dominance?
_______________________________________________________________
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
48
Heredity
Name ______________________________ Class ___________________ Date __________________
CRITICAL THINKING
14. Explain Mendel’s experiment. Use the words dominant and recessive, homozygous and
heterozygous. What did Mendel discover? You can use Punnett squares to illustrate your
essay.
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INTERPRETING GRAPHICS
Use the Punnett square below to answer questions 15–17. Write the letter of the correct answer in
the space provided.
_____ 15. In which box is Pp?
16.
In which box is PP?
17.
In which box is pp?
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Science and Technology
49
Heredity