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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. ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ 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