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Name: ______________________________________ Pd: __________ Date:________ Punnett Square Pre-test Directions: Match each definition with the word it belongs with. Place the letter on the line. 1. 2. 3. 4. 5. 6. 7. 8. ____ Heterozygous ____ Homozygous ____ Purebred ____ Hybrid ____ Punnett Square ____ Probability ____ Phenotype ____ Genotype a. A graphic used to predict the results of a genetic cross b. An organism’s physical appearance, or visible trait c. Having two different alleles for a trait (Tt) d. The offspring of generations that have the same traits e. Having two identical alleles for a trait (TT or tt) f. A number that describes how likely it is that an event will occur g. An organism’s genetic makeup, or allele combinations h. The offspring of generations that have two different alleles for a trait 9. In humans, being able to roll your tongue (R) is dominant over not being able to (r). A man who can roll his tongue marries a woman who cannot roll her tongue and they have three children, two of whom can roll their tongues and one who cannot. Draw the Punnett Square that illustrates the possible outcomes of this marriage. 10. What is the man’s phenotype? ___________________________________________________________ 11. What is the man’s genotype? ____________________________________________________________ 12. What are the genotypes of the children? ___________________________________________________ ____________________________________________________________________________________ 13. In the critter world, having a blue tail (T) is dominant over having an orange tail (t). A critter with a heterozygous genotype has children with an orange tailed critter. Draw the Punnett Square that illustrates the possible outcomes of their critter pups. 14. What percentage of the critter pups will have orange tails? ____________________________________ 15. What is the ratio of orange tails pups to blue tails pups? _______________________________________ Name: ______________________________________ Pd: __________ Date:________ Punnett Square Post-test Directions: Match each definition with the word it belongs with. Place the letter on the line. 1. 2. 3. 4. 5. 6. 7. 8. ____ Heterozygous ____ Homozygous ____ Purebred ____ Hybrid ____ Punnett Square ____ Probability ____ Phenotype ____ Genotype a. A graphic used to predict the results of a genetic cross b. An organism’s physical appearance, or visible trait c. Having two different alleles for a trait (Tt) d. The offspring of generations that have the same traits e. Having two identical alleles for a trait (TT or tt) f. A number that describes how likely it is that an event will occur g. An organism’s genetic makeup, or allele combinations h. The offspring of generations that have two different alleles for a trait 9. In humans, being able to roll your tongue (R) is dominant over not being able to (r). A man who can roll his tongue marries a woman who cannot roll her tongue and they have three children, two of whom can roll their tongues and one who cannot. Draw the Punnett Square that illustrates the possible outcomes of this marriage. 10. What is the man’s phenotype? ___________________________________________________________ 11. What is the man’s genotype? ____________________________________________________________ 12. What are the genotypes of the children? ___________________________________________________ ____________________________________________________________________________________ 13. In the critter world, having a blue tail (T) is dominant over having an orange tail (t). A critter with a heterozygous genotype has children with an orange tailed critter. Draw the Punnett Square that illustrates the possible outcomes of their critter pups. 14. What percentage of the critter pups will have orange tails? ____________________________________ 15. What is the ratio of orange tails pups to blue tails pups? _______________________________________