Unit 1 Review. 3. If the male parent had the following genotypes, what alleles would his gametes (sperm) contain? A. AABB B. AaBb C. aabb D.
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1 Unit 1 Review 1. Define the following terms: a. Genotype b. Phenotype c. Dominant allele d. Recessive allele e. Homozygous f. Heterozygous g. Parental generation h. F1 generation i. Test cross j. Punnett square k. Monohybrid cross l. Dihybrid cross 2. If the male parent had the following genotypes, what allele would his gametes (sperm) contain? A. AA B. Aa C. aa 3. If the male parent had the following genotypes, what alleles would his gametes (sperm) contain? A. AABB B. AaBb C. aabb D. AABb 4. Determine if the following genotypes are homozygous dominant, homozygous recessive, or heterozygous. a. HH b. Aa c. AA d. hh e. Hh f. Bb g. bb h. BB 5. If purple (P) is dominant to white flowers (p), then what is the phenotype for the following individuals? a. PP b. Pp Page 1 of 9
2 c. pp 6. If purple (P) is dominant to white flowers (p) and Smooth (S) petals are dominant to wrinkly (s) petals, then what is the phenotypes for the following individuals? a. PPSS b. PPSs c. PPss d. PpSS e. PpSs f. Ppss g. ppss h. ppss i. ppss 7. Fill in the missing portions (indicated with? ) of the Punnett square of a cross between individuals with genotypes AA and AA. 8. Fill in the missing potions (indicated with? ) of the Punnett square of a cross between individuals with genotypes aa and aa. 9. Fill in the missing portions (indicated with? ) of the Punnett square of a cross between individuals with genotypes Aa and Aa. Page 2 of 9
3 10. Fill in the entire Punnett square of a cross between individuals with genotypes Bb and BB. 11. Use the Punnett square below and the following information: Long (L) is dominant to short (l). Answer the following questions. a. What is the predicted genotypic ratio of the offspring, expressed by listing dominant before recessive? Page 3 of 9
4 b. What is the predicted phenotypic ratio of the offspring, expressed by listing dominant before recessive? c. What is the predicted proportion of offspring that has long hair? d. What is the predicted proportion of offspring that has short hair? e. What is the predicted percentage of offspring that has long hair? f. What is the predicted percentage of offspring that has short hair? 12. Use the Punnett square below and the following information: Long (L) is dominant to short (l). Answer the following questions. a. What is the predicted genotypic ratio of the offspring, expressed by listing homozygous dominant before heterozygous before homozygous recessive? b. What is the predicted phenotypic ratio of the offspring, expressed by listing dominant before recessive? c. What is the predicted proportion of offspring that has long hair? d. What is the predicted proportion of offspring that has short hair? e. What is the predicted percentage of offspring that has long hair? f. What is the predicted percentage of offspring that has short hair? 13. Use the Punnett square below and the following information: Long (L) is dominant to short (l). Answer the following questions. Page 4 of 9
5 a. What is the predicted genotypic ratio of the offspring, expressed by listing homozygous dominant before heterozygous before homozygous recessive? b. What is the predicted phenotypic ratio of the offspring, expressed by listing dominant before recessive? c. What is the predicted proportion of offspring that has long hair? d. What is the predicted proportion of offspring that has short hair? e. What is the predicted percentage of offspring that has long hair? f. What is the predicted percentage of offspring that has short hair? 14. Fill in the missing portions (indicated with? ) of the Punnett square of a cross between individuals with genotypes GGHH and GGHH. 15. Fill in the missing portions (indicated with? ) of the Punnett square of a cross between individuals with genotypes GgHh and GgHh. Page 5 of 9
6 16. Fill in the missing portions (indicated with? ) of the Punnett square of a cross between individuals with genotypes GGHH and gghh. Page 6 of 9
7 17. Fill in the entire Punnett square of a cross between individuals with genotypes Gghh and GgHh. 18. Use the Punnett square below and the following information: Brown (B) is dominant to green (b) and Hairy (H) is dominant to bald (h). Answer the following questions. Page 7 of 9
8 a. What are the genotypes of the parents? b. What are the phenotypes of the parents? c. What are the genotypes of the F1 generation? d. What are the phenotypes of the F1 generation? 19. Which of the following is an example of a testcross? A. An unknown against a homozygous dominant B. An unknown against an unknown C. An unknown against a homozygous recessive 20. If you were conducting a testcross with an unknown individual for one allele and you found the offspring to be 50% one phenotype and 50% the other, then what was the genotype of the unknown? A. Homozygous dominant B. Heterozygous C. Homozygous recessive D. Unknown based on this information 21. If you crossed two pea plants that were heterozygous for pea shape [smooth (S) dominant to wrinkled (s)] and flower color [purple (P) dominant to white (p)], what genotypic ratio would you expect? A. 9:3:3:1 B. 1:1:1:1 C. 1:2:2:4:1:2:1:2:1 22. Backcrossing can be used to do which of the following? A. To create an individual that is genetically more like one of its parents B. To create a completely unique individual C. To save an endangered species D. Both A and C 23. If you were to cross a purple flowered individual with the genotype Pp (purple is dominant to white) with another purple flowered individual with the genotype PP, then what phenotype ratio would you expect? A. 100% of the offspring will be purple flowered (1:0). B. 50% will be purple flowered, and 50% will be white flowered. C. 100% of the offspring will be white flowered (0:1). 24. If you conducted a dihybrid cross for pea color [Green (G) is dominant to yellow (g)] and plant height [Tall (T) is dominant to short (t)], then what phenotypic ratio would you expect? A. 9:3:3:1 Page 8 of 9
9 B. 1:1:1:1 C. 1:2:2:2:2:1:2:2:1:1 25. If you cross two ladybugs that have spots and stripes (two codominant traits), then what would the phenotypic and genotypic ratios be in the offspring (in that order)? A. 1:2:1 and 3:1 B. 3:1 and 1:2:1 C. 3:1 and 3:1 D. 1:2:1 and 1:2:1 26. If you conduct a testcross with an individual with an unknown genotype that has green peas and purple flowers (Green-G is dominant to yellow-g and purple-p is dominant to white-p), then what phenotypic ratio would you expect in your offspring if your unknown was heterozygous for green and homozygous for purple? A. 1/2 would be green purple, and 1/2 would be yellow purple. B. 1/2 would be green purple, and 1/2 would be green white. C. 1/2 would be green white, and 1/2 would be yellow white. D. none of the above 27. The Punnett Square was created by Reginald Punnett and will show you which of the following? A. The probability of different phenotypes in the next generation B. The phenotypes of the next generation C. The genotypes of the next generation D. All of the above 28. The Principle of Independent Assortment indicates which of the following? A. When gametes are formed, all traits will be inherited independently. B. When gametes are formed, unlinked alleles will assort independently. C. Gametes will contain one copy of each chromosome. D. Gametes will contain chromosomes that have undergone. Page 9 of 9
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