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Unit 4: Reproduction and Genetics Lesson 12: Dominant and Recessive Genes

Unit 4: Reproduction and Genetics Lesson 12: Dominant and Recessive Genes . Colorado Agriscience Curriculum. I. Monohybrid Crosses. A. Three class genotypes 1. Homozygous Dominant = BB 2. Homozygous Recessive = bb 3. Heterozygous = Bb B. B = Black & b = Red C. Six possible crosses:

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Unit 4: Reproduction and Genetics Lesson 12: Dominant and Recessive Genes

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  1. Unit 4: Reproduction and GeneticsLesson 12: Dominant and Recessive Genes Colorado Agriscience Curriculum

  2. I. Monohybrid Crosses • A. Three class genotypes • 1. Homozygous Dominant = BB • 2. Homozygous Recessive = bb • 3. Heterozygous = Bb • B. B = Black & b = Red • C. Six possible crosses: BB x BB, BB x Bb, BB x bb, Bb x Bb, Bb x bb, bb x bb Unit 4, Lesson 12 Dominant and Recessive PP

  3. I. Predicting Ratio’s • Homozygous x Homozygous • A. Genotype • 2. Results in a homozygous dominant zygote • B. BB x BB • Phenotype: • 1. Each parent can only contribute a dominant gene Unit 4, Lesson 12 Dominant and Recessive PP

  4. I. Predicting Ratios • B. Homozygous x Homozygous • . bb x bb • All will be red • Genotypic Ratio • 4bb : 0 • Phenotypic Ratio • 4 red coats : 0 black coats Unit 4, Lesson 12 Dominant and Recessive PP

  5. I. Six Fundamentals Types of Mating • Homozygous x Homozygous • F. BB x bb • Genotypic ratio: • 0BB : 4Bb • All offspring will be heterozygous • Phenotypic ratio: 4 black coat : 0 red coat Unit 4, Lesson 12 Dominant and Recessive PP

  6. II. Predicting RatiosHomozymous x Heterozygous • E. BB x Bb • 1. Genotypic Ratio • 2 BB : 2 Bb • 2. Phenotypic Ratio • a) 4 Black color Unit 4, Lesson 12 Dominant and Recessive PP

  7. III. Predicting Ratio’s • G. Bb x Bb • 1. Phenotypic Ratio • a) 3 black to 1 red or 3:1 • 2. Genotypic Ratio • a) 1BB: 2Bb: 1bb Unit 4, Lesson 12 Dominant and Recessive PP

  8. IV. Predicting Ratio • H. Bb x bb • 1. Genotypic Ratio • a) 2Bb: 2bb • 2. Phenotypic Ratio • a) 2 black to 2 red Unit 4, Lesson 12 Dominant and Recessive PP

  9. II. Multiple Gene Pairs • A. Mating • 1. B = Black & b = Red • 2. P = Polled & p = polled • B. Bull • 1. BbPp • C. Cow • 1. BbPp • D. What will the phenotypic & genotypic ratios be? Unit 4, Lesson 12 Dominant and Recessive PP

  10. II. Multiple Gene Pairs Unit 4, Lesson 12 Dominant and Recessive PP

  11. II. Multiple Gene Pairs • E. Genotypic Ratio • 1. 1 PPBB: 2 PPBb: 1 PPbb: 2 PpBB: 4 PpBb: 2 Ppbb: 2 ppBb: 1ppbb • F. Phenotype • 1. 9 polled and black • 2. 3 polled and red • 3. 3 horned and black • 4. 1 horned and red Unit 4, Lesson 12 Dominant and Recessive PP

  12. Worksheet 1 Unit 4, Lesson 12 Dominant and Recessive PP

  13. Worksheet 2 Unit 4, Lesson 12 Dominant and Recessive PP

  14. Worksheet 3 Unit 4, Lesson 12 Dominant and Recessive PP

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