Dominance, Incomplete dominance, Codominance , and Meiosis Review

1. Dominance, Incomplete dominance, Codominance, and Meiosis Review Quiz Tomorrow!

2. Teams • Group A (Name?) • Group B (Name?) Teams take turns answering questions. Each team gets thirty seconds to answer their question before the other group has a chance to steal it. The other group then has to answer immediately. For each correct answer during your group’s turn, you get 10 points. For each stolen question answered correctly, you get 20 points. If there is a tie at the end, the groups will choose a representative to duel. Ro-sham will decide which team gets the first question.

3. Glittering Prizes • The winning team may choose one of thequizquestions.

4. 1. ABO blood type is an example of which type of dominance? • Codominance

5. 2. Is blood type a genotype or phenotype? • phenotype

6. 3. If two parents both have blood type O, which blood types is it possible for their children to have? • Only O

7. 4. Which blood type is the universal receiver? Include ABO type and Rh factor. • AB+

8. 5. True or false: A person with blood type A has anti-A antibodies. • False. The person will have anti-B antibodies.

9. 6. How is incomplete dominance different from codominance? • In incomplete dominance, the third phenotype is a blending of the dominant and recessive phenotypes. In contrast, with codominance, both dominant phenotypes are expressed when an individual has a genotype with two dominant alleles.

10. 7. What is the difference between a gene and an allele? • Alleles are different versions of a gene.

11. 8. If a red flower crossed with a white flower produced pink flowers, what form of dominance would that be? • Incomplete dominance

12. 9. List the stages of meiosis in order (Hint: start with prophase I, go through the stages, then again starting with prophase II.) • Prophase I, Metaphase I, Anaphase I, Telophase I, Prophase II, Metaphase II, Anaphase II, Telophase II

13. 10. How many daughter cells does meiosis result in? • four

14. 11. Name two differences between mitosis and meiosis. • Mitosis results in two identical daughter cells for the purpose of growth or repair; meiosis results in four genetically different daughter cells that are gametes, either egg or sperm cells.

15. 11. Are gametes (produced by meiosis) haploid or diploid? • Haploid

16. 12. When will gametes become diploid cells? • Fertilization: A sperm and egg cell will fuse.

17. 13. The alleles written on the outside of the Punnett square are the alleles in possible ___________. • Gametes/Egg or sperm

18. 14. True or false: Recessive alleles are always more rare than dominant alleles. • False.

19. 15. The blue people were an example of which type of dominance? • Incomplete dominance. Heterozygous individuals converted metHb at a rate between normal and blue people.

20. 16. Use two of the following words to describe the genotype AA:heterozygous, homozygous, dominant, recessive • Homozygous dominant

21. This is the end of Part I. Congrats to whichever team won Part I! Start thinking of your quiz question. Now we’ll start Part II. The team that wins Part II can also choose a quiz question.In Part II, both teams will work on Punnett Square problems at the same time. one individual from each team will be randomly chosen to submit the team’s answer.Scoring:First team done, answer correct: +2 Second team done, answer correct: +1First team done, answer incorrect: -2Second team done, answer incorrect: -1

22. 16. In mice, black eyes are dominant over red eyes. What are the ratios of possible genotypes and phenotypes of the offspring if a homozygous, black eyed mouse is crossed with a red eyed, female mouse? • 100% Bb, black eyes

23. 17. Predict the ratios of genotypes and phenotypes of the offspring of a heterozygous female mouse and a red-eyed male mouse. • Bb (female) x bb (male) bb B B 50% Bb  black-eyed 50% bb  red-eyed

24. 18. There are two alleles for pea pod, smooth and wrinkled. Two heterozygous, smooth pea pod plants are crossed. Predict the genotypic and phenotypic ratios of the offspring. • SsxSs S s bbs S s 25% SS + 50% Ss  75% smooth 25% ss wrinkled

25. 19. In humans, acondroplasia “dwarfism” (D) is dominant over normal (d). A homozygous dominant (DD) person dies before the age of one. A heterozygous (Dd) person is dwarfed. A homozygous recessive individual is normal. If a heterozygous dwarf man marries a dwarf heterozygous woman, what is the probability of a child that dies before the age of one? • Dd (female) xDd (male) D d bbs D d 25% DD

26. 20. In Dalmatian dogs, the gene for black spots is dominant to the gene for liver colored spots.A breeder has a black spotted dog and wants to know if it is homozygous(BB) or heterozygous(Bb). She remembers some genetics from high school, so she mates with a liver-spotted dog (bb). Some of the offspring have black spots and some have liver-colored spots. What is the genotype of her dog? • B?x bb B ? bbs b B Bb= black spots Since some have liver-colored spots, her dog must be Bb.

27. 21. In humans straight hair (SS) and curly hair (CC) are codominant traits, that result in hybrids who have wavy hair (sc). Cross a curly-haired female with a wavy-haired male. What is the chance of a straight-haired child? • CC (female) x SC (male) C C bbs S C Straight hair= SS, 0% chance

28. 22. BONUS QUESTION (worth double!):A female guinea pig is heterozygous for both fur color and coat texture is crossed with a male that has light fur color and is heterozygous for coat texture. What phenotypic ratios of offspring can they produce?Dark fur color is dominant (D) and light fur (d) is recessive. Rough coat texture (R) is dominant, while smooth coat (r) is recessive. • DdRr (female) xddRr (male) DR Dr dRdr dR dR dr dr D_R_ = dark& rough 6/16 ddR_= light&rough 6/16 D_rr =dark&smooth 2/16 ddrr= light&smooth 2/16