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Activity 14

Activity 14. Genes and Chromosomes. Read the introduction. How does the behavior of chromosomes in cells help to explain the behavior of genes that are passed from one generation to the next?. Challenge. How do genes and chromosomes behave during meiosis and sexual reproduction?.

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Activity 14

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  1. Activity 14 Genes and Chromosomes

  2. Read the introduction. • How does the behavior of chromosomes in cells help to explain the behavior of genes that are passed from one generation to the next?

  3. Challenge • How do genes and chromosomes behave during meiosis and sexual reproduction?

  4. Student Sheet 14.1, “Three-level Reading Guide: Genes and Chromosomes,” presents statements that require three levels of understanding. Determine which statements are supported by the text.

  5. Crossing Over

  6. Analysis 1 • Explain the relationship between genes, chromosomes, and DNA.

  7. Analysis 2 • A species of snail has 24 chromosomes—12 pairs—in each somatic cell. How many chromosomes are there in a snail egg cell? A snail sperm cell?

  8. Analysis 6 and 7 6. The chromosomes pictured below are from a fruit fly that is heterozygous for two traits. How many kinds of gametes could form if this were in a male? A female? 7. Consider your answer to Question 6. Explain how crossing over could affect the gametes that result.

  9. Revisit the Challenge • How do genes and chromosomes behave during meiosis and sexual reproduction?

  10. Key Vocabulary • chromosome • crossing over • diploid • gamete • gene • haploid • karyotype • law of independent assortment • meiosis • mitosis • nondisjunction • somatic cell

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