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Warm- Up # 4

Warm- Up # 4. What is a dominant trait? What is a recessive trait? Is “Bb” genotype or phenotype? Is black hair genotype or phenotype? Which of these is heterozygous: A. TT B. Tt C. tt. Learning Target 1/31.

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Warm- Up # 4

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  1. Warm- Up # 4 • What is a dominant trait? • What is a recessive trait? • Is “Bb” genotype or phenotype? • Is black hair genotype or phenotype? • Which of these is heterozygous: A. TT B. Tt C. tt

  2. Learning Target 1/31 • I can determine the genotype and phenotype of a monohybrid cross using a Punnett Square

  3. Vocab Review • Genotype - the genetic make-up of an organism HH: homozygous dominant Hh: heterozygous dominant hh: homozygous recessive • Phenotype: the way an organism looks or behaves based on the genotype (trait) Examples: left-handed, brown eyes, long nose

  4. CH 11 Punnett Squares Notes

  5. Mendel’s Law of Segregation Alleles separate during meiosis Rr R r R r Sperm Sperm

  6. Mendel’s Law of Independent Assortment An individual can give lots of combinations of alleles RrGg rG RG Rg rg

  7. Punnett Squares • Punnett Square - a tool used to predict the genotype of an organism’s offspring Bb Male Female Bb

  8. Example Punnett Square • Trait: Body Color dominant = green body (G) recessive = blue body (g) Parent #1: Gg Parent #2: Gg G g G GG Gg Gg gg g

  9. Example Punnett Square • Possible OffspringGenotypes: 1 GG 25% 2 Gg 50% 1 gg 25% G g G GG Gg Possible Offspring Phenotypes: 3 green body 75% 1 blue body 25% Gg gg g dominant = green body (G) recessive = blue body (h)

  10. Practice Problem #1 • Trait: Human Eye Color dominant = brown eyes (B) recessive = blue eyes (b) Parent #1: BB Parent #2: Bb B B B BB BB b Bb Bb

  11. Practice Problem #1 • Possible OffspringGenotypes: 2 BB 50% 2 Bb 50% Possible Offspring Phenotypes: 4 brown eyes 100% 0 blue eyes 0% B B B BB BB Bb Bb b

  12. Practice Problem #2 • In many animals black fur is dominant (B) and brown fur is recessive (b). • Complete the Punnett Square for Female dog-Bb Male dog- bb B b Bb bb b Bb bb b

  13. Practice Problem #2 • Possible genotypes: 2 Bb 50% 2 bb 50% • Possible phenotypes: 2 Black fur dog 50% 2 Brown fur dog 50% B b Bb bb b Bb bb b

  14. Practice Problem #3 R r Rr rr r Rr rr r • In people right-handed is dominant (R) and left-handed is recessive (r) • Complete the Punnett Square for: Heterozygous parent Homozygous recessive parent

  15. Practice Problem #3 • Possible genotypes: 2 Rr 50%2 rr 50% • Possible phenotypes: 2 Right-handed 50%2 Left-handed 50% R r Rr rr r Rr rr r

  16. Monohybrid cross • Homozygous dominant + homozygous recessive • Example: BB x bb, HH x hh B B Bb Bb b Bb Bb b

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