Practice Exam _1 KEY - / Form A Name(print): BHD311D...

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Unformatted text preview: / Form A Name(print): BHD311D Spfing2007 Dr. Zhao Name(sign): EXAM J SELECT THE SINGLE BEST ANSWER FOR EACH OF THE FOLLOWING: (QESpOWHSforeachquesfion) 1. What is the most important difference between meiosis and mitosis? a. Meiosis is faster than mitosis. b. Meiosis produces different varieties of cells, whereas mitosis produces identical daughter cells. c. Meiosis occurs only in somatic cells and mitosis occurs in gametic cells. d. Both a and b e. Both 1') and C 2. in prophase l of meiosis, the number or chromatids in a cell of a person with Turner's syndrome (X0) is a. 23. b. 45. c. 180. d. 90. e. 92. 3. During meiosis, sister chromatids separate during a. anaphase I. b. anaphase II. c. S phase. d. synapsis. e. telophase II. 4. which statement about asexual reproduction is true? a. In asexual reproduction, a cell is divided by a furrowing of the plasma membrane. b. Asexual reproduction necessarily involves meiosis. c. in asexual reproduction, there is genetic variation among the offspring. d. In asexual reproduction, two gametes fuse to produce a zygote. e. Asexual reproduction produces a clone of offspring that are genetically identical to the parent. 5. In meiosis, a. a single nucleus gives rise to two daughter nuclei. b. the daughter nuclei are genetically identical to the parent nucleus. c. the centromeres separate at the onset of anaphase I. d. homologous chromosomes synapse in prophase I. e. no spindle forms. 6. A person with Speck syndrome has how many sex chromosomes in each of his body cells? a. 23 b. 1 Cr 2 d. 3 e. 24 7. Which of the following is not true of homologous chromosome pairs? a. They come from only one of the individual's parents. b. They usually contain slightly different versions of the same genetic information. o. They segregate from each other during meiosis I. d. They synapse during meiosis I. e. Each contains two sister chromatids at the beginning of meiosis I. 8. Different forms of a gene are called a. traits. b . phenotypes . c. genotypes. d. alleles. c. None of the above 9. In Mendel's experiments, if the allele for tall (T) plants was incompletely dominant over the allele for short (t) plants, what Offspring would have resulted from crossing two Tt plants? a. 1/4 tall; 1/2 intermediate height; 1/4 short b. 1/2 tall; 1/4 intermediate height; 1/4 short c. 1/4 tall; 1/4 intermediate height; 1/2 short d. All the offspring would have been tall. e. All the offspring would have been of intermediate height. 10. It has been found that at a certain locus of the human genome, 200 different alleles exist in the population. Each person has at most alleles. . a. l b. 2 c. 100 d. 200 e. 400 11. Cleft chin is a sex linked dominant trait. A man with a cleft chin marries a woman with a round chin. What percent of their female progeny will show the cleft chin trait? a. O b. 25% c. 50% d. 75% e. 100% 12. Which of the following forms is the correct way to write the name given to the domestic cat in the binomial system of nomenclature? Felis domestica ' Felis Domestica folis domestica . Felis domestica felis domestica m “()b‘m Ix; 13. In micc, short hair is dominant to long hair. If a short—haired individual is crossed with a long—haired individual and both long— and short—haired offspring result, you can conclude that a. the short—haired individual is homozygous. b. the short-haired individual is heterozygous. c. the long-haired individual is homozygous. d. the long—haired individual is heterozygous. e. This cannot be answered without more infornetlon. 14. In dogs, erect ears and barking while following a scent are due to dominant alleles; droopy ears and silence while following a scent are due to recessive alleles. A dog homozygous for both traits is mated to a droopy—eared, silent follower. If the two genes are on different chromosomes, the expected F1 phenotypic ratios should be a. 9:3:3zl. b. 1:1. C. 16:0. d. l:?:]. e. None of the above 15. A man who carries an Y—linked allele will pass it on to all of his children. half of his daughters. all of his sons. half of his sons. all of his daughters. 0 Q()U’fl 16. The ABO blood groups in humans are determined by a multiple allelic system in which IA and 149 are codominant and are dominant to i. If an infant born to a type 0 mother also is type 0, possible genotypes for the father are a. O or A. ’ b. A or B. c. 0 only. d. 0, A, or B. e. impossible to determine. 17. is the effect produced when a bee carries pollen from one population to another. a. Gene flow b. A population bottleneck c Genetic drift d. Genetic equilibrium e Non—random mating Q) 18. 19. 21. 22. 23. selection occurs when the extremes of a population contribute relatively few offspring to Lhe next generation as compared to average members of the a. b. C. d. e. Selection acts on a. b. C. d. e. phenotypic; _population. Corrective Directional Stabilizing Disruptive Natural variaLion; however, evolution depends on variation. genetic genetic; phonotypic genetic; environmentally-induced environmentally-induced; phenotypic environmentally—induced; genetic A gene pool consists of all the alleles a. b. c. d. e . of an individual’s genotype. present in a specific population. that occur in a species throughout its evolutionary existence. that contribute to the next generation of a population. of a biome. A mutation occurs in one or your lung cells. Which of the following is true? a. You have evolved to be better adapted to your environment. b. You will soon die because most mutations are lethal. c. You will be sterile and no longer be able to have children. d. The human species will have evolved because this mutation will be passed on to your children. 6. This mutation does not affect human evolution because it will not be passed on to your offspring. Natural selection acts directly on the Species that are in the same genotype to produce new mutations. phenotype to produce new mutations. genotype to favor existing mutations. phenotype to favor traits due to existing mutations. genotype to inhibit new mutations. are more closely related than species that are only in the same a. class order b. kingdom phylum c. family ... order d. phylum class e. family genus 24. 25. 26. 27. 28. 29. m Q-O U'W which of the following factors probably was not important in the formation of the many species of Darwin’s finches on the Galapagos Islands? which of the following is a prezygotic isolation.- a. b. C . d. e. Geographical isolation from the mainland Polyploidy Different habitats on the different islands Geographical isolation of one island from another Different food supplies on the different islands mechanism? Abnormal meiosis following fertilization Infertile hybrids Reduced viability of hybrids Abnormal mitosis following fertilization Variation in mating pheromones The modern polar bear species evolved from ancestral bear populations in southern Alaska that became separated by glaciers from bear populations in the rest of North America. This type of event is called a. b. C. d. e. allopatric speciation. temporal isolation. mechanical isolation. sympatric speciation. None of the above Six platyfish with different tail spotting patterns live in eastern Mexico. of Five of them can interbreed and produce fertile offspring. One them cannot interbreed with the other five. What can you conclude about these platyfish? Q Q ozrm They all belong to the same biological species. They each are a different biological species. There are two biological species in the example above. There is not enough data given to draw a conclusion. There are six biological species in the example above. Which of the following is not true about prezygotic reproductive barriers? a.Sperm of one species may not attach to the egg of another species because the eggs do not release the appropriate Chemicals. b.1ndividuals of a species may reject individuals of other species as mating partners. c.Differences in sizes and shapes of reproductive organs may prevent the union of gametes from different species. d.Organisms have mating periods that are as long as few days or weeks. e.Individuals of different species may select different places in the environment in which to live. Reptiles dominated the: a. b. C. d. e. Proterozoic era. Paleozoic era. mesozoic era. Cenozoic era. Triassic era. U'I 30. A genus is a a. group of closely related species. b. group of genera. group of similar genotypes. taxonomic unit larger than a family. taxonomic unit smaller than a species. 00.0 31. Which of the following is not a way in which phylogenies are used? a. To establish evolutionary relationships b. To determine how rapidly traits evolve c. To determine historical patterns of movement of organisms d. To provide relatively stable names for organisms e. To infer evolutionary trends Ewan”! ='—___‘_l—" I Taxonl Taxonll l , _.__a,,r.__| l__;__.l Examl Figure l 32.(refer the Fxmnlffignel) The organism labeled B in the figure is a common ancestor to: a. organism 2. b. organism 3. c. organism 5. d. organism 6. e. All of the above. 33. (refer the Exmanfiguel) a. organism 2, 3, B, 5, and 6 form a clade b. organism 2, 3, C, 5, 6, and E form a clade c. organism 4, 5 6, E, D, and B form a clade d. organism 2, 3, C, B, D, 4, S, 6 form a clade e. organism 4, 5 D, E, and 6 form a clade For short answer questions, give concise, intelligible answers; complete sentences are not necessary. (Spts) Matching: Each choice may be used more than once. 4 A. Genotype 1. An individual having 2 identical alleles at a particular locus B. Incomplete do inance . The outward physical appearance of an individual. L; C. Heterozygot . The dominant appearance ofa Bb individual. ( D. Homozygote 4. The entire genetic constitution of an individual. 2'5 E. Phenotype . The Bb individual. 2 (2 . Spts) What are the five canditions that must be met for a population to be in Hardy—Weinberg equilibrium. I. [no Mkfa'fim 2. (wrge fofula’t‘m (“to jewefi‘c drift ) 5. Rotated. {ram oar/tar fofuw‘ims (#2139916 ‘F/o at Random We]??? 5/710 5e{ect?m (4pts)De£inez Pleiotropy The abi/ij of A. fx‘mj/e 78746 n Lowe ’yhbbif:}7!€ €76§§C€3§ ‘ Phylogeny Th9 evo(“f:m~rj [disco/:7 475k 5/98d6g or 717107? of Fekd'gd Sfeciej. \l \-‘-——- "- l I O ('1‘ 0 3 1 h t O ‘1 rt Y (B U) m :1 m 0 l i It! n: j l in ti A B C Which of the diagrams above depicts a cell in prophase of mitosis? A How many chromosomes are there in this cell? i Which of the diagrams above depicts a cell at the end of mitosis? 5 How many chromosomes are there in this cell? % Are the chromosomes in this cell identical to or different from the chromosomes in the cell that divided to produce it? . Which of the diagrams above depicts a cell in prophase of meiosis 1‘? D How many chromosomes are there in this cell? ‘ 'Which of the diagrams above depicts‘a cell at the e‘nd'of meiosis 1? C How many chromosomes are there in this cell? 2— . ,4 Which of thediagrams above depicts a cell ai’the end of meiosis 2? fig How many chromosomes are there in this cell? 2- Are the chromosomes in this cell identical to or different from the chromosomes in the cell that divided to produceit? d} d rf/ij {0% . ‘ " Which of the diagrams above depicts a with which crossing-over couidocour‘? D ...
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Practice Exam _1 KEY - / Form A Name(print): BHD311D...

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