Exam_1_Key - .9 9 Form A...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: \ .9 9 Form A Namfifln‘illt)1———:[—/‘< - BKJ311D Spnng2009 Dr. Zhao Name(sign): EXAM] SELECT THE SINGLE BEST ANSWER FOR EACH OF THE FOLLOWING: (2.5 points for each question) 1. In Meiosis, the sister chromatids separate during a. anaphase I. b. metaphasc I. c. anaphase II. d. metaphase II. e. interpose II. 2. Each sperm cell of a donkey contains 31 chromosomes. How many chromosomes are there in each of the horse's body cells? a. 15.5 b. 31 c. .35 or 16 pairs d. Either 31 or 62, depending on the cell type e. 62 3. An individual with a genetic makeup of AAbbCCdd is said to be a . true-breeding . b. recessive. c. hybrid. d . dihybrid . e. heterozygous. 4. The diploid chromosome number of people with Down syndrome is 47; how many chromosomes are likely to be in each of their gametes? a. 47 b. 23.5 c. 46 d. 23 or 24 e. none of these 5. NaLural selecLion is most nearly the same as a. diploidy. b. qene tlow. c. genetic drift. d- nonrandom mating. e. differential reproductive success. Kg." . 3,: ”é 6. Grasshoppers have 11 pair of autosomes, and one sex chromosome. Which chromosome in Figure above is the sex chromosome? a. e b. x c. j d. k e. h 7. In Ligers, a recessive allele causes a white tiger (absence of fur pigmentation). If two phenotypically normal tigers that are heterozygous at this locus are mated, what percentage of their offspring is expected to be white? a. 50% b. 75% c. about 66% d. about 90% e. 25% 8. A man has extra digits (six fingers on each hand and six toes on each foot). His wife and their daughter have a normal number of digits. Having extra digits is a dominant trait- The couple's second child has extra digits. What is the probability that their uexL (Lhird) child will have extra digits? a. 1/2. b. 1/16 c. 1/8 d. 3/4 c. 9/16 9. When Mendel crossed yellow—seeded and green—seeded pea plants, all the offspring were yellow seeded. When he took these Fl yellOW—seeded plants and crossed them to green-seeded plants, what genotypic ratio is expected? a. 1:2:1 :3:1 a 0:0 U espxaw l. I. I! II F‘HLUP :l:l IQ 10. 11. 12. 13. 14. 15. Hemophilia is caused by several genetic factors; one, a recessive allele of an X—linked gene, is the subject of this problem. Assume that a man with hemophilia marries a normal woman whose father had hemophilia. What is the probability that they will have a daughter with hemophilia? a 1/16 b. 1/8 c. 1/4 d. 1/2 e. 3/4 Many crustaceans (e.g., lobsters, shrimp, and crayfish) use their tails to swim, but crabs have much reduced tails that curl under their shells and are not used in swimming. This is an example of a. artificial selection. b. an extinction. c. the law of segregation. d. a vestigial trait. e. polyploiday. Why did Darwin argue that evidence of extinction supports the theory of evolution? a. It shows that reproduction is more important than survival. b. It shows that lower organisms have died to make way for humans. c. It shows that nothing lasts forever. 6. It shows that the number and types of species have changed over time. e. None of the above. which of these individuals is most likely to be successful in an evolutionary sense? a. A personal trainer who works out at the gym every day. b. A scientist who devotes herself to science and wins the Nobel Prize. c. A sperm donor who anonymously fathers 52 children. d. A woman who home schools her two children. e. a reproductively sterile individual who never falls ill. Which of the following is the best modern definition of evolution? a. descent without modification. b. change in allele frequencies in a population over time. c. survival of the descent. d. inheritance of acquired characters. 0. changes make species better and better. For biologists studying a large flatworm population in the lab, which Hardy—Weinberg condition is most difficult to meet? a. No selection b- No genetic drifL c. No gene flow d. No mutation e. Random mating l6. l7. 18. 19. 20. Homologous chromosomes a. are identical. b. carry information for the same traits. c. carry the same alleles. d. align on the metaphase plate in meiosis II. e. separate in anaphase of meiOSis TT- Genetic drift occurs in a population. which of the fo]]owing statements might be true? a. Genetic drift increased the population's fitness. b. Genetic drift decreased the population's fitness. c. The population was relatively small. d. Two of the above statements might be true. 6. Any of the above statements might be true. An earthquake decimates a ground-squirrel population. The surviving population happens Lo have broader stripes on average than the initial population. If broadness of stripes is genetically determined, what effect has the ground—squirrel population experienced during the earthquake? a. Directional selection b. Disruptive selection c. A mutation d. A bottleneck effect e. Gene flow Which of the following is the most predictable outcome of increased gene flow between two populations? a. Lower average Fitness in both populations b. Higher average fitness in both populations c. Increased genetic difference between the two populations d. Decreased genetic difference between the two populations e. Increased genetic drifL Three species of songbirds look very similar, but the males have courtship songs that sound different. What function would this difference in song likely serve if the populations came in contact? a. A prezygotic isolating mechanism b. A postzygotic isolating mechanism c. A gametic isolating mechanism d. A habitat isolating mechanism e- All of the above Which of the following does not tend to promote speciation? a. mutation ' b. gene flow c. natural selection d. polvploidv e. All of the above 22. A storm brings two formerly separated populations of beetles together. 23. 24. 25. 26. 27. They look very similar. Under the biological species concept, which of the following would show that the two populations are different species? a. One population breeds in spring, the other in fall. b. Males of the two populations have different flight patterns in courtship. c. When individuals from the two populations mate with each other in the laboratory, the eggs fail to hatch. d. All of the above is correct. e. None of the above is correct. What is the correct format for the scientific name of an extinct carnivorous dinosaur? a. tyrannosaurus 325 b. lyrannosaurus Egg c. Tyrannosaurus rex d. Tyrannosaurus rex e. tyrannosaurus reg Using standard conventions for naming alleles, which of the following pairs is correct? a. Tt — recessive phenotype b. TT — heterozygous c. tt - homozygous d. tt - dominant phenotype e. All of the above A man who carries an X—linked allele will pass it on to . all of his children. half of his daughters. all of his sons. half of his sons. . none of the above. 0 Q(IU'D Why have domains been added to the present system of classification? a. Additional information has been gained from molecular studies. b. There are so many differences among bacteria that it is necessary to divide them. c. Distantly related organisms have been found to resemble one another. d. Fossils have been found that differ from organisms alive today. e. Both A and B are correct. The prevention of genetic exchange between two species because they reproduce at different times of the day, season, or year is called: a. hybrid sterility. b. genetic isolation. c. sexual isolation. d. mechanical isolation. e. temporal isolation. 28. The term “dominant" means that: a. the dominant phenotype shows up at least 50% of the time in the first generation. b. all members of the F2 generation of a hybrid cross exhibit Lhe dominant phenotype. c. one allele can mask the expression of another in a hybrid. ,d. the dominant phenotype shows up in 100% of the offspring in all generations. e. the dominant phenotype is more beneficial than the recessive phenotype. 29. The largest or most inclusive group listed below is: a. Class b. Order c. Phylum d. Genus e. Family 30. Which Kingdom contains mostly unicellular cukaryotic organisms? a. Eubacteria b. Protista c. Animalia d.Fungi e.PlanLae 31. Which of the following is the term for a human cell that contains 22 pairs of autosomes and two X chromosomes? a. a male body cell b- a female body cell c. a sperm cell d. an unfertilized egg cell e- Both b and d are correct. 32. Which of the following terms belongs least suitably with the others? a. synapsis b. chiasmata C. tetrad d. metaphase e. crossing over 33. Which of the following statements is FALSE? a. Individuals with the same phenotype might have different genotypes. b. Matings between individuals with dominant phenotypes cannot produce offspring with recessive phenotypes. C. Matings between individuals with recessive phenotypes usually do noL produce offspring with dominant phenotypes. d. Individuals with the same genotype might have different phenotypes. e. Individual’s phenotype may caused by incomplete dominance. 34. The present system of biological classification contains six kingdoms. which of the following does not belong to any of the six kingdoms? a. bacteria 1:. AIDS virus C. single—cell organisms d. green plants e. elephants For short answer questions, give concise, intelligible answers; complete sentences are not necessary. (31:12:55) For each of the genotypes shown below, indicate all of the possible gametes that an individual with the given genotype could produce (assume that in each case the genes are located on different chromosomes): m: AM) AM. Fer: F3 nag! 3C3 am. on, DLt (1LT, olLt. (4pts)Define: Directional selection: [Va/hora}: seleoflm ’m Wit/3061 lmdlvzd’l’LMS 07% one, owl of Jr/he pheno tfHfic Pit/"71:76, sum/We or reproduce ’More succesS-fuLLj WWW via other l'fldlt/I'Dlom’eg‘ Synapsis: Tiyedgairiuj of replicafeal hawoéo flu; chromosome; dwr-i'nj (imp/mm I of’melpsfs I (4pts 1. Sin ) Fill in the blank: gle—celled organisms that lack a nucleus belong to the two In. domains Archaeo. and Lander 2. The 3. Two . . M aid process of me1051s produces four daughter cells. species of mountain dwelling salamanders are separated by an \ ) 9 impassable valley. The speciation is called a/{LOflh‘lC SEQClflé'fn individual with two identical alleles of a gene is said to be said to be Heteijgoflj (4pts)Matchinq: A. The statement is true 1. Homologous chromosomes synapse for mitosis only. and crossing over occurs. B. The statement is true 2. This occurs when a cell divides for meiosis I only. to form two cells that are genetically identical. C. The statement is true 3. Centromeres uncouple and v I l n “Pf - for IIILLOb‘lS and melOSlS II. chromatids are separated from D. The for each other. statement is true . 4. The process(es)1s(are)proceded mitosis and meiosis I. by copying<replication)of the DNA ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern