Name: Date: Copyright © 2014 by Seventh-day Adventists/North American Division Office of Education Level 7 What Is Complex Inheritance? Complete the table using the following patterns of inheritance: incomplete dominance, codominance, polygenic, sex-linked, multiple alleles Pattern of Inheritance Characteristics of Pattern 1. More than one dominant allele is expressed in the phenotype. 2. A blend of the parents’ traits appears in the phenotype of the offspring. 3. More than two alleles exist for the trait. Any two may combine in the allele pair. 4. Several genes interact to determine a trait. 5. A trait is determined by a single allele on the X chromosome. Answer the following items on the lines provided. 6. A pink-flowered snapdragon with the genotype RW is crossed with a white-flowered snapdragon with the genotype WW . What percentage of the offspring is expected to have red flowers? Explain. 7. The disease of hemophilia is inherited, but it rarely occurs in girls. Suggest a reason why. 8. Type II diabetes runs in families, but its frequency has been rising in recent years. What factors might explain this increase in type II diabetes? Chapter 4 • Lesson 3 Use with pp. 156–164 Lesson Support Essential Question KH_BD1_SJG7_U1C04L3_LS.indd 2 8/15/14 11:05 AM

Essential Question What Is Complex Inheritance?

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Page 1: Essential Question What Is Complex Inheritance?

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Level 7

What Is Complex Inheritance?Complete the table using the following patterns of inheritance: incomplete dominance, codominance, polygenic, sex-linked, multiple alleles

Pattern of Inheritance Characteristics of Pattern

1. More than one dominant allele is expressed in the phenotype.

2. A blend of the parents’ traits appears in the phenotype of the offspring.

3. More than two alleles exist for the trait. Any two may combine in the allele pair.

4. Several genes interact to determine a trait.

5. A trait is determined by a single allele on the X chromosome.

Answer the following items on the lines provided.

6. A pink-flowered snapdragon with the genotype RW is crossed with a white-flowered snapdragon with the genotype WW. What percentage of the offspring is expected to have red flowers? Explain.

7. The disease of hemophilia is inherited, but it rarely occurs in girls. Suggest a reason why.

8. Type II diabetes runs in families, but its frequency has been rising in recent years. What factors might explain this increase in type II diabetes?

Chapter 4 • Lesson 3 Use with pp. 156–164 Lesson Support

Essential Question

KH_BD1_SJG7_U1C04L3_LS.indd 2 8/15/14 11:05 AM