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ISU BIOL 211 - Practice_Test_Exam_3

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Handout Title: Practice Exam 3Supplemental InstructionIowa State UniversityLeader: Cody Course: Biology 211 (1)Instructor: Dr. SerbDate: 11/14/101. Things that prevent an egg from being fertilized are called ____ barriers to reproduction. a. post-zygotic b. mutational c. phenotypic d. pre-zygotic2. Traits that are developed during the course of an individual's life, such as muscle tone or a particular skill set (knitting, baseball, driving) are termed _____ by biologists.a. vestigial traits b. evolutionary adaptations c. acquired characteristics d. uniformitarianism3. The smallest unit that can evolve is the ___.a. population b. cell c. ecosystem d. individual4. Vestigial structures are anatomical structures that ___ a. are found on the body wall. b. look similar in different species, but have different functions. c. have more than one function. d. have no function5. The sum of all allele frequencies at a given genetic locus ___.a. is the square root of p2. b. is equal to 1. c. is equal to 2pq. d. the genotype frequency of the population.6. You are studying a recessive genetic disorder. The allele frequency of the disordered allele (p) is 0.04% Which portion of the Hardy-Weinberg equation would you use to determine the number of "normal individuals" (neither affected nor carriers) in a given population?a. p2 b. p c. q d. 2pq7. Which of the following would be considered an example of mechanical isolation as a barrier to reproduction?a. incompatible genitalia b. mountain ranges that separate two populations c. different mating seasons d. incompatible gametesSupplemental Instruction1060 Hixson-Lied Student Success Center v 294-6624 v www.si.iastate.edu8. Natural selection changes allele frequencies because some ___ survive and reproduce more successfully than others.a. loci b. individuals c. populationsd. species9. The biological species concept will NOT work with ____.a. plants b. invertebrate animals c. organisms that reproduce asexually d. fungi, since all fungi require water to reproduce10. A population has a genotype frequency of 36% for the homozygous dominant individuals. What is the genotype frequency for heterozygous individuals in the population?a. 6% b. 48% c. 40% d. 60%11. The founder and bottleneck effects are both forms of ____.a. genetic drift b. gene flow c. directional selectiond. phenotypic polymorphism12. Two species of raven with different mating songs are separated by ____ barriers to reproduction.a. temporal b. mechanical c. gamete incompatibility d. behavioral13. A population of wildflowers was separated by a flash flood that changed the course of a nearby river. The river split the east side of a meadow from the west side. After several generations, the east side and west side flowers could no longer interbreed. This is an example of ___.a. mechanical isolation b. temporal speciation c. allopatric speciation d. hybrid breakdown14. Which of the following does not alter allele frequencies in a population?a. founder effects b. random mating c. bottlenecks \d. gene flow15. You are studying carriers of a recessive genetic disorder. These people can have an affected offspring, but aren't themselves affected. Which portion of the Hardy-Weinberg equation would you use to determine the number of carriers in a given population?a. p b. q2 c. qd. 2pq16. Which of the following would be considered an example of a postzygotic barrier to reproduction?a. a fertilized egg that fails to develop into a viable offspringb. different mating seasons c. mountain ranges that separate two populations d. incompatible gametes17. An individual pine tree expresses a mutation that increases its pollen production, but changesthe timing of the maturation of its pollen cones. This change causes it to no longer interbreed with trees nearby. According to the biological species definition ____ has occurred. a. allopatric speciation b. exaptation c. sympatric speciation d. anagenesis18. A doctor may order an amniocentesis and ____ to determine the number and nature of fetal chromosomes during a high-risk pregnancy.a. genotype b. karyotypec. pleiotropic fusion d. phenotype19. If you describe an individual as being PpDDCc, you are giving the ___ of the individual.a. test cross b. phenotype c. pleiotropic fusion d. genotype20. In humans, having a widow's peak is dominant to not having a widow's peak. If a man with a widow's peak (Ww) married a woman with a widow's peak (Ww), what is the chance that their first child would NOT have a widow's peak?a. 50% b. 33% c. 25% d. 100%21. A couple find that they are both carriers for Ty-Sachs disease, what is the chance that any child they have will develop Ty-Sachs?a. 75% b. 0% c. 50% d. 25%22. According to Mendel, while we each have two alleles for every trait, we pass only one of these alleles to an offspring. These two alleles separate during ___.a. Anaphase of meiosis Ib. Fertilization c. cytokinesis of meiosis II d. anaphase of mitosis23. If two genes are linked, they are ___. a. epistatic to one another, like the B genes and C genes that determine mouse fur color b. found on the same chromosome c. likely to be inherited independently of one another d. going to segregate into different gametes most of the time24. In humans sex linked recessive disorders are most commonly found in ___ because ___.a. females: they are on the Y chromosome b. males: they are on the Y chromosomec. males: they are on the X chromosome d. females: they are on the X chromosome25. Given the cross of AaBBCcdd x aaBbCcDd, what is the chance of having an offspring with an AABbccdd genotype?a. 1/64 b. 0% c. 1/8d. 1/1626. A carrier (someone who may pass on a disorder but is not affected by the disorder) of a genetic disorder must be ____.a. a heterozygote b. carrying co-dominantly expressed traits c. carrying harmful alleles linked to the X chromosome d. homozygous dominant27. Crossing an organism with an unknown genotype and dominant phenotype to an organism with a recessive phenotype is called a ____.a. cytogenetic map b. aneuploid splint c. pleiotrophic shunt d. test cross28. A gene that affects more than one phenotypic trait is said to be ___.a. dihybrid b. polygenic c. pleiotropic d. wild type29. The most "fit" individuals in terms of evolution are those that


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ISU BIOL 211 - Practice_Test_Exam_3

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