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One Stop Shop For Educators The following instructional plan is part of a GaDOE collection of Unit Frameworks, Performance Tasks, examples of Student Work, and Teacher Commentary. Many more GaDOE approved instructional plans are available by using the Search Standards feature located on GeorgiaStandards.Org. Georgia Performance Standards Framework for Life Science- 7th Grade Unit: Heredity ~ Genetics Differentiated (Tiered) Task Selective Breeding Subject Area: Science Grade: 7th Standards (Content and Characteristics): S7L3: Students will recognize how biological traits are passed on to successive generations. a. Explain the role of genes and chromosomes in the process of inheriting a specific trait. c. Recognize that selective breeding can produce plants or animals with desired traits. Enduring Understanding: Selective breeding is used to produce organisms with desired traits. Essential Question(s): How does selective breeding work? Pre-Assessment: Have students create a graphic organizer such as a web diagram where they list all they know about selective breeding. BASIC Outcome/ Performance Level Indicator Performance Task: (Detailed Description) Teacher role? Student role? INTERMEDIATE ADVANCED Students will use Punnett squares to recognize that selective breeding produces desired traits. Students will be given two traits and will create illustrated Punnett squares to demonstrate how selective breeding is used to produce offspring with desired traits. Student Role: • Students will be given the scenario that a plant nursery wants to create plants that always have purple blooms since those are the colors most desired Students will be given the scenario that a plant nursery wants to create plants that always have purple blooms since those are the colors most desired by consumers. One plant is heterozygous dominant and the other is homozygous recessive. Student Role: • Students will create a series of Punnett squares to Georgia Department of Education Kathy Cox, State Superintendent of Schools Life Science y 7th Grade y Energy Flow and Nutrient Cycling August 8, 2007y Page 1 of 4 Copyright 2007 © All Rights Reserved Students will investigate how dogs have been selectively bred to produce desired traits by listening to the guest speaker and locating information in materials provided by the teacher. Student Role: • Student will compile information about selective breeding in dogs. One Stop Shop For Educators Georgia Performance Standards Framework for Life Science- 7th Grade by consumers. • • • Students will be given a picture of a purple plant on a • colored sheet of paper with its heterozygous genotype listed. They will also be • given a picture of a white plant on a piece of transparency film with its homozygous recessive genotype listed. Students will cut the pictures apart to illustrate the alleles that make up the genotype. • Students will fill in • their Punnett squares and record the phenotype. They will use their pictures to help with this process. (The recessive traits on the transparency film will not “show up” on top of the dominant trait on colored paper) paste those pictures into the blank Punnett square provided by the teacher to show the cross between the two organisms. illustrate the • process of selective breeding. Students will record the genotypes and phenotypes of each generation. Students will record the percentage of offspring with the resulting phenotypes for each generation. Teacher Role: Review Punnett squares, dominant/recessiv e traits, and alleles Introduce the concept of selective breeding Georgia Department of Education Kathy Cox, State Superintendent of Schools Life Science y 7th Grade y Energy Flow and Nutrient Cycling August 8, 2007y Page 2 of 4 Copyright 2007 © All Rights Reserved Students will create a series of Punnett squares to illustrate the process of selective breeding. • Students will record the genotypes and phenotypes of each generation. • Students will record the percentage of offspring with the resulting phenotypes for each generation. • Students may choose to create a multimedia story (i.e., Photostory 3, free software from Microsoft) or a hard copied children’s book that communicates the information that they learned about selective breeding in dogs including its pros and cons. Teacher Role: • Introduce the concept of selective breeding. One Stop Shop For Educators Georgia Performance Standards Framework for Life Science- 7th Grade • Students will be instructed to choose two offspring from the first match and repeat the steps. • Students will repeat this process until they have Punnett squares in which 100% of the offspring are purple. Teacher Role: • Review Punnett squares, dominant/recessive traits, and alleles • Introduce the concept of selective breeding • Provide blank Punnett squares. • Arrange for a local veterinarian to come speak to students about selective breeding of dogs, both the benefits and possible pitfalls. • Provide resource materials and give opportunity for research • Resources Provide multiple pictures of the genetic traits. Markers, glue, pictures of plants as described, blank Punnett squares Classroom text resources, paper, pencil Computer, classroom text resources, guest speaker Extension: Repeat the process for a recessive trait. Compare/Contrast Extension: Students can research how “selective breeding” has occurred as a result of evolution. Homework/Extens ion Extension: Repeat the process for the recessive trait. Compare/Contrast Instructional Tasks Accommodations for ELL Students Pair with proficient speaker. Allow students to use native language resources for research. Hand out to show different steps in completing a Punnett square. Georgia Department of Education Kathy Cox, State Superintendent of Schools Life Science y 7th Grade y Energy Flow and Nutrient Cycling August 8, 2007y Page 3 of 4 Copyright 2007 © All Rights Reserved One Stop Shop For Educators Georgia Performance Standards Framework for Life Science- 7th Grade Instructional Tasks Accommodations for Students with Specific Disabilities Instructional Tasks Accommodations for Gifted Students Limit the resources the students can use for research. Identify websites students may use for research. Allow students to type research results. Use colored Punnett squares or number Punnett squares to help students remain organized. Have students research how modern agriculture practices are using selective breeding to make the products more marketable. What are some of the potential consequences of these procedures? Georgia Department of Education Kathy Cox, State Superintendent of Schools Life Science y 7th Grade y Energy Flow and Nutrient Cycling August 8, 2007y Page 4 of 4 Copyright 2007 © All Rights Reserved