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Activity 4

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Activity 4

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  1. Activity 4 Breeding Corn

  2. Corn Reproductive Structures

  3. Read the introduction. • Sexual reproduction is reproduction in which two parents contribute genetic material to the offspring. • Selective breeding is the process by which organisms with desirable traits are mated with the goal of producing even more desirable offspring.

  4. Challenge • How can information about the genetic makeup of plants help farmers breed plants for desirable traits?

  5. Breeding Corn: First Generation

  6. Basic Genetics • An organism has two copies of the gene for each of its traits. These copies are called alleles. • A dominant trait will mask another version of a trait.A recessive trait will be hidden by a dominant trait.

  7. Creating a Punnett Square

  8. Which describes the cross that produced ear A? Ear B? Punnett Square X Punnett Square Y Punnett Square Z

  9. Breeding Corn: Second Generation

  10. Analysis 1 • How does a Punnett square show the possible results of a cross between two individuals?

  11. Analysis 3 • What do you predict will happen if a purple corn plant with the genes Pp is bred with a corn plant with purple kernels and the genes PP? Explain your answer, and include a matching Punnett Square.

  12. Analysis 4 • How could scientists use selective breeding to help solve a sustainability challenge such as breeding a crop that can survive drought?

  13. Revisit the Challenge • How can information about the genetic makeup of plants help farmers breed plants for desirable traits?

  14. Key Vocabulary • allele • dominant • Punnett square • recessive • selective breeding • sexual reproduction • trait