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Name Date Class Content Practice A LESSON 2 Understanding Inheritance Directions: On the line before each definition, write the letter of the term that matches it correctly. Each term is used only once. E 1. threadlike structures in cells A. dominance I 2. contain instructions for traits B. pedigree K 3. two different forms of a gene P 4. outward appearance C 5. determines outward appearance F. codominance A 6. represented by uppercase letters G. homozygous M 7. represented by lowercase letters H. incomplete dominance G 8. RR I. genes D 9. Rr O 10. shows possible outcomes of genetic crosses B 11. shows inherited traits in a family M. recessiveness H 12. produces a blend of the parents’ phenotypes N. polygenic inheritance F 13. when both alleles are expressed O. Punnett square L 14. determines human blood type P. phenotype N 15. when multiple genes determine a phenotype J 16. can sometimes influence expression of genes C. genotype D. heterozygous E. chromosomes J. environmental factors K. alleles L. multiple alleles Name Date Content Practice B Understanding Inheritance Directions: On the line before each statement, write the letter of the correct answer. B 1. Segments of chromosomes that contain coded information for an organism’s traits are called A. cells. B. genes. C. alleles. D. genotypes. C 2. The outward expression, or appearance, of a genetic trait is its A. allele. B. pedigree. C. phenotype. D. inheritance. B 3. The designation Rr for a pea-plant’s peas shows that the plant is A. purple. B. a hybrid. C. homozygous. D. a true-breeding plant. D 4. A model that is used to show possible outcomes of cross-breeding is a A. ratio. B. coin toss. C. pedigree. D. Punnett square. A 5. A cow with red hairs and white hairs in its coat is an example of A. codominance. B. multiple alleles. C. polygenic inheritance. D. incomplete dominance. C 6. Variations in people’s height and eye color are due to A. codominance. B. multiple alleles. C. polygenic inheritance. D. incomplete dominance. Class