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Name: ______________________________________Date: ____________Period: _______ Assign#: _____ Genetics Practice Problems Unit 6 / Chapter 11 1. For each genotype listed below, tell whether it is heterozygous or homozygous. AA __________________ Gg ____________________ Xx ______________________ Bb ___________________ mm ___________________ TT ______________________ 2. For each genotype listed below, tell what the phenotype would be. Round plant seeds are dominant to wrinkled seeds. Short tails in cats are recessive. RR ______________________ TT ______________________ Rr _______________________ Tt _______________________ rr ________________________ tt ________________________ 3. For each phenotype, list the genotype. (Use the first letter of the dominant trait.) Brown eyes are dominant to blue eyes. Black feathers are dominant to white feathers. _____ brown eyes _____ black feathers _____ brown eyes _____ black feathers _____ blue eyes _____ white feathers Match each term below with the correct definition on the right. _____ 4. heterozygous A. chart that shows the genotypes of all the possible offspring of two _____ 5. Punnett square parents _____ 6. genotype B. the chance that a particular event will occur _____ 7. alleles C. different forms of a gene _____ 8. probability D. organism that has two different genes for a trait _____ 9. homozygous E. organism that has two identical genes for a trait _____ 10. phenotype F. physical appearance of an organism G. genes that an organism has Complete the two Punnett squares, then answer the questions below. The genes in the two squares represent eye color: brown eyes (B) are dominant to blue eyes (b). Punnett Square A Punnett Square B B b B b BB BB Bb Bb 11. What is the probability that the offspring in Punnett Square A will have blue eyes? _______ 12. What is the probability that the offspring in Punnett Square A will have brown eyes? ______ 13. What is the probability that the offspring in Punnett Square A will have two brown genes? _____ 14. What is the probability that the offspring in Punnett Square A will be heterozygous? _____ 15. What are the genotypes of the two parents in Punnett Square B? _____ and ______ 16. What are the phenotypes of the two parents in Punnett Square B? _________ and __________ Name: ______________________________________Date: ____________Period: _______ Assign#: _____ Genetics Practice Problems Unit 6 / Chapter 11 1. For each genotype listed below, tell whether it is heterozygous or homozygous. AA __________________ Gg ____________________ Xx ______________________ Bb ___________________ mm ___________________ TT ______________________ 2. For each genotype listed below, tell what the phenotype would be. Round plant seeds are dominant to wrinkled seeds. Short tails in cats are recessive. RR ______________________ TT ______________________ Rr _______________________ Tt _______________________ rr ________________________ tt ________________________ 3. For each phenotype, list the genotype. (Use the first letter of the dominant trait.) Brown eyes are dominant to blue eyes. Black feathers are dominant to white feathers. _____ brown eyes _____ black feathers _____ brown eyes _____ black feathers _____ blue eyes _____ white feathers Match each term below with the correct definition on the right. _____ 4. heterozygous A. chart that shows the genotypes of all the possible offspring of two _____ 5. Punnett square parents _____ 6. genotype B. the chance that a particular event will occur _____ 7. alleles C. different forms of a gene _____ 8. probability D. organism that has two different genes for a trait _____ 9. homozygous E. organism that has two identical genes for a trait _____ 10. phenotype F. physical appearance of an organism G. genes that an organism has Complete the two Punnett squares, then answer the questions below. The genes in the two squares represent eye color: brown eyes (B) are dominant to blue eyes (b). Punnett Square A Punnett Square B B b B b BB BB Bb Bb 11. What is the probability that the offspring in Punnett Square A will have blue eyes? _______ 12. What is the probability that the offspring in Punnett Square A will have brown eyes? ______ 13. What is the probability that the offspring in Punnett Square A will have two brown genes? _____ 14. What is the probability that the offspring in Punnett Square A will be heterozygous? _____ 15. What are the genotypes of the two parents in Punnett Square B? _____ and ______ 16. What are the phenotypes of the two parents in Punnett Square B? _________ and __________ 17. What is the probability that the offspring in Punnett Square B will have brown eyes? _____ 18. What is the probability that the offspring in Punnett Square B will have blue eyes? ______ 19. What is the probability that the offspring in Punnett Square B will be homozygous? ______ A homozygous brown-eyed woman marries a blue-eyed man. 20. What is the genotype of the woman? _______ 21. What is the genotype of the man? ________ 22. What is the probability that the man and woman above will have brown-eyed children? ____ In cattle, having no horns is a dominant trait. 23. What is the phenotype of a cow that is Hh? ______ 24. What is the genotype of a male calf with horns? _______ 25. Neither of the calf’s parents have horns. What must be the genotypes of the parents? Mother _______ Father _______ 26. If the calf is mated with a cow that is heterozygous for horns, what is the probability that they will have offspring with horns? _______ 27. If the cattle in question 25 have 10 offspring, how many of them will be heterozygous for horns? _____ In pea plants, purple flowers are dominant and white flowers are recessive. 28. What are the possible genotypes of a plant with purple flowers? ________________________ 29. If a white flowered plant is pollinated by a heterozygous purple flowered plant, what is the probability that their offspring will be a. purple? ___________ c. white? _________ b. heterozygous? _______ d. homozygous? _______ 30. If two heterozygous pea plants are crossed, what is the probability that their offspring will be a. purple? ___________ c. white? _________ b. heterozygous? _______ d. homozygous? _______ Bonus! A rare blue-flowered plant is accidentally pollinated by a common white flowered plant. All of the offspring are white. Which color is dominant? _______ Which color is recessive? ______ What is the genotype of the blue-flowered plant? _______ 17. What is the probability that the offspring in Punnett Square B will have brown eyes? _____ 18. What is the probability that the offspring in Punnett Square B will have blue eyes? ______ 19. What is the probability that the offspring in Punnett Square B will be homozygous? ______ A homozygous brown-eyed woman marries a blue-eyed man. 20. What is the genotype of the woman? _______ 21. What is the genotype of the man? ________ 22. What is the probability that the man and woman above will have brown-eyed children? ____ In cattle, having no horns is a dominant trait. 23. What is the phenotype of a cow that is Hh? ______ 24. What is the genotype of a male calf with horns? _______ 25. Neither of the calf’s parents have horns. What must be the genotypes of the parents? Mother _______ Father _______ 26. If the calf is mated with a cow that is heterozygous for horns, what is the probability that they will have offspring with horns? _______ 27. If the cattle in question 25 have 10 offspring, how many of them will be heterozygous for horns? _____ In pea plants, purple flowers are dominant and white flowers are recessive. 28. What are the possible genotypes of a plant with purple flowers? ________________________ 29. If a white flowered plant is pollinated by a heterozygous purple flowered plant, what is the probability that their offspring will be a. purple? ___________ c. white? _________ b. heterozygous? _______ d. homozygous? _______ 30. If two heterozygous pea plants are crossed, what is the probability that their offspring will be a. purple? ___________ c. white? _________ b. heterozygous? _______ d. homozygous? _______ Bonus! A rare blue-flowered plant is accidentally pollinated by a common white flowered plant. All of the offspring are white. Which color is dominant? _______ Which color is recessive? ______ What is the genotype of the blue-flowered plant? _______
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