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Probability

TOPIC : Genetics Aim: Describe how to use punnett squares. Do Now : For the seed shape trait “R” represents round and “r” represents wrinkled. Give the genotypes and phenotypes for the three following gene combinations : RR, Rr, and rr HW : Activity: I’m all Keyed Up – DUE WEDNESDAY.

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Probability

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  1. TOPIC: GeneticsAim: Describe how to use punnett squares.Do Now: For the seed shape trait “R” represents round and “r” represents wrinkled. Give the genotypes and phenotypes for the three following gene combinations: RR, Rr, and rrHW: Activity: I’m all Keyed Up – DUE WEDNESDAY

  2. The phenotype of an organism a. represents its genetic composition b. reflects all the traits that are actually expressed c. occurs only in dominant pure organisms d. cannot be seen

  3. If an individual possesses two recessive alleles for the same trait, the individual is said to be a. homozygous for the trait             b. haploid for the trait c. heterozygous for the trait           d. mutated

  4. Probability • The possibility that an event may or may not happen

  5. 1/4 = 25% 2/4 = 50% 3/4 = 75% 4/4 = 100%

  6. Punnett Square • Special chart that shows possible gene combinations of offspring bw 2 organisms

  7. T T Example: 1. T = tall t = short TT x tt t t T t T T t t T t

  8. T T T t t T t t T t T t Phenotype= • 100% tall Genotype= 100% heterozygous

  9. B b 2. B = Black fur b = white fur Bb x Bb B B B B b b B b b b

  10. B b B b B B B b B b b b Phenotype= 75% black, 25 % white Genotype= 25% homozygous dominant 25% homozygous recessive 50% heterozygous

  11. Red is dominant in flowers & white is recessive. Cross a heterozygous flower with a homozygous dominant flower. • R = redr = white • Rr x RR

  12. Rr x RR R r Phenotype= R r R R R 100%red R R R R r Genotype = 50% homozygous dominant 50% heterozygous

  13. One dog carries heterozygous, black fur traits, and the other carries homozygous recessive white traits. What are the chances of having a puppy with black fur? B = black, b = white Bb x bb

  14. B b Bb x bb b b b B b Answer: 50% chance of having a puppy with black fur b B b b b

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