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Trait: Plant height Alleles: T (tall) and t (short) Type of Heredity: Complete dominance

#1. Trait: Plant height Alleles: T (tall) and t (short) Type of Heredity: Complete dominance Problem: Cross between two homozygous plants, one tall and one short. Find: Percent chance of every possible genotype. #2. Trait: Ability to roll the tongue

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Trait: Plant height Alleles: T (tall) and t (short) Type of Heredity: Complete dominance

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  1. #1 • Trait: Plant height • Alleles: T (tall) and t (short) • Type of Heredity: Complete dominance • Problem: Cross between two homozygous plants, one tall and one short • Find: • Percent chance of every possible genotype

  2. #2 • Trait: Ability to roll the tongue • Alleles: R (can roll) & r (cannot roll) • Type of Heredity: Complete dominance • Problem: Two hybrids cross • Find: • Probability (as a fraction) of every possible phenotype

  3. #3 • Trait: Hitchhiker’s thumb • Alleles: H (doesn’t have one) & h (has one) • Type of Heredity: Complete dominance • Problem: A homozygous recessive female crosses with a heterozygous male. • Find: • Ratio of every possible genotype

  4. #4 One gene controls whether a person has a widow’s peak or not. W (having a widow’s peak) is completely dominant over w (not having one). • Find: • Is it possible for two people, both with widow’s peaks, to have a child who doesn’t have a widow’s peak? _____

  5. #5 • Trait: Coat color in cats • Alleles: B (black) & W (white) • Type of Heredity: Incomplete dominance • Problem: A female with a black coat crosses with a heterozygous male • Find: • Genotype of the parent cats • Female __________ • Male __________ • Phenotype of the parent cats • Female __________ • Male __________

  6. #6 • Trait: Feather color in chickens • Alleles: B (black) & W (white) • Type of Heredity: Codominance • Problem: A black hen breeds with a white rooster. • Find: • Phenotype of the offspring _____ • Probability (as a fraction) of every possible phenotype

  7. #7 • Trait: Human blood type • Alleles: A (codominant), B (codominant), O (recessive) • Type of Heredity: Codominance • Problem: A female with heterozygous B-type blood crosses with a male with AB-type blood • Find: • Percent chance of having a child with: • - A-type blood _____ • - B-type blood _____ • - AB-type blood _____ • - O-type blood _____

  8. #8 Liz has O-type blood. Find: • If her mom has A-type blood, what are the possible genotypes that her dad could have? _____ , _____ or _____

  9. #9 • Trait: Hemophilia (disorder in which a person’s blood doesn’t clot properly) • Chomosomes/Alleles: XH (normal), Xh (hemophilia), Y • Type of Heredity: A sex-linked gene, XH is the dominant allele (complete dominance) • Problem: A heterozygous female (carrier) crosses with a male with hemophilia • Find: • Percent chance that their children will be: • - Normal (and not carriers) _____ • - Carriers _____ • - Have hemophilia _____

  10. #10 Julia sets up an experiment where she crosses a tall plant with a short plant. All of the plants in the next generation are tall. • Find: • The type of inheritance that controls this trait _______________________ • The genotypes of the parent plants _____ & _____

  11. #11 George sets up an experiment where he crosses a purebred plant with red flowers with a purebred plant with white flowers. All of the plants in the next generation have flowers with red and white spots. • Find: • The type of inheritance that controls this trait • ________________________ • The genotypes of the parent plants _____ & _____

  12. #12 You are exploring the jungle and find a new species of plant. Some of the plants have red flowers and some have yellow flowers. You cross a red flowering plant with a yellow flowering plant and all the offspring have orange flowers. • Find: • The type of inheritance that controls this trait _______________________ • The genotypes of the parent plants _____ & _____

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