Lesson 3 mendellian genetics & heredity

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The 3rd lesson in a series of lessons on Mendelian genetics and heredity. This PP is meant to serve as a guide/framework for the lesson.

The 3rd lesson in a series of lessons on Mendelian genetics and heredity. This PP is meant to serve as a guide/framework for the lesson.

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  • 1. Mendellian Genetics & Heredity Dihybrid Crosses
  • 2. Today’s schedule: Warm-up Review of Punnett squares and monohybrid crosses Review of ratios and percentages Introduce dihybrid crosses Work collaboratively on dihybrid crosses Game: We are alleles
  • 3. Common coreMSDE (2012):INDICATOR3.3.2 The student will illustrate and explain how expressed traits are passed from parent to offspring.Assessment limits: phenotypes (expression of inherited characteristics) dominant and recessive traits sex-linked traits (X-linked only; recessive phenotypes are more often expressed in the male) genotypes (represented by heterozygous and homozygous pairs of alleles) Punnett square (use to predict and/or interpret the results of a genetic cross; translate genotypes into phenotypes - monohybrid only) pedigree (use to interpret patterns of inheritance within a family)
  • 4. Warm uphint: use a Punnett square to solve Grey fur is dominant White fur is recessive Female is heterozygous for grey fur Male has white fur Determine the possible genotypes and phenotypes of their offspring Express each genotype and phenotype as a ratio
  • 5. objectives By the end of today’s lesson, students will be able to discuss Mendelian genetics & heredity using scientific vocabulary with 95% accuracy by practicing it in small groups. By the end of today’s lesson students will know how to express the outcome of crosses as ratios and percentages with 85% accuracy. By the end of today’s lesson students will understand how to create and use a Punnett square for dihybrid crosses with 80% accuracy.
  • 6. try this…. Grey fur is dominant; white fur is recessive Red eyes are dominant; black eyes are recessive Female is heterozygous for grey fur and has black eyes Male has white fur and is homozygous dominant for red eyes. Determine the possible genotypes and phenotypes of their offspring.
  • 7. picture it… Grey fur is dominant; white fur is recessive Red eyes are dominant; black eyes are recessive Female is heterozygous for grey fur and has black eyes Male has white fur and is homozygous dominant for red eyes. Determine the possible genotypes and phenotypes of their offspring.
  • 8. Classwork Please work with your seat-mates to complete the worksheet: http://betterlesson.com/document/78673/bikini- bottom-dihybrid-practice?from=search
  • 9. Talk with your mates What do you think…..?
  • 10. homework…a reviewComplete this review on line:http://www.athro.com/evo/gen/punexam.htmlAfter you complete the review, please fill this in (found in your handout package):On this page you have given _____answers of which ______were right. **this information is provided to you after you complete the review
  • 11. Exit ticket: what do we need to talkmore about? Meiosis/Mitosis Gene sorting Vocabulary Offspring Ratios Punnett squares  Monohybrid crosses  Dihybrid crosses
  • 12. References McDonald, L. (2010, September 09). Bikini bottom dihybrid practice. Retrieved from www.betterlesson.com NOVA (2012) Excerpt from NOVA: Cracking Your Genetic Code [Video]. Retreived from http://www.teachersdomain.org/asset/cygc12_vid _cancergene/