SI 11-6-6 Practice Exam IIIBio 211-5 Part IIMultiple Choice:1. Males have the sex chromosomes __ and __ while females have __ and __.a. XX, XYb. XY, XXc. YY, XYd. XY, YY2. Mutations introduce _______ into a population.a. natural selectionb. new speciesc. programmed cell deathd. genetic variation3. What does it mean to be a “carrier” of a gene?a. the organism is heterozygous and “carries” the recessive gene but it is not expressed in the phenotype.b. the organism is homozygous recessive and the recessive gene is expressed in the phenotype.c. the gene is hidden on a different chromosome due to translocationd. there are more than two copies of the gene in the organism so it is said to be “carrying” an extra copy.4. For crossing over to have a significant effect, it has to take place between ______.a. sister chromatids of the same chromosomeb. non-sister chromatids of homologous chromosomesc. sex chromosomes, one X and one Yd. exact copies of the same chromosome5. A 3:1 phenotypic ratio results from a _____ cross and a 9:3:3:1 ratio results from a ______ cross.a. F1, F2b. hybrid, dihybridc. single, doubled. parental, F16. A population is _______.a. located in the same geographic areab. composed of one speciesc. the smallest unit that can evolved. all of the above7. A population in Hardy-Weinberg equilibrium has two alleles, R and r, at a particular locus. The frequency of the “R” allele is 0.5. What is the percentage of the population that is heterozygous for this allele?a. 15%b. 20%c. 25%d. 50%8. Eye color in fruit flies is sex linked. If a red eyes male fruit fly is crossed with a true breeding white eyed female and the F1 generation are inbred, what fraction of the F2 generation will be white eyed males?a. 0b. 1/16c. 1/8d. 1/49. Why were pea plants well suited for Mendel’s studies?a. they grow fastb. it is easy to control pollination experimentsc. each trait examined was on a separate chromosomed. all of the above10. What is the mRNA sequence that would pair with the DNA sequence CTAGGACTT?a. AAGTCCTAGb. GAUCCUGAAc. GUTCCTCUUd. GATCCTGAAMatching:1. Takes place when a population is divided geographically.2. All the genes in a given population.3. Used to find the genotype of an unknown.4. A normal allele is referred to as _____.5. Occurs when a few individuals become isolated from the larger population6. A violation of the Hardy-Weinberg Equilibrium.7. When a sudden change in the environment drastically changes the population size and alters the gene pool.Z. Allopatric SpeciationY. Non-random matingX. Bottleneck EffectW. Founder EffectV. Gene FlowU. Gene PoolT. Sympatric SpeciationS. TestcrossR. Wild
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