Genetics 301 Sample Final Examination

Genetics 301 Sample utmost Examination Spring 2003 50 Multiple Choice Questions(Choose the best answer)1. A cross between ii true breeding lines one with disastrous blue flowers and one with bright white flowers professional personduces F1 offspring that are light blue. When the F1 progeny are selfed a 121 ratio of dark blue to light blue to white flowers is observed. What transmissible phenomenon is reproducible with these results?a. epistasisb. incomplete dominancec. codominanced. inbreeding depressione. random mating2. Mutations which exit in body cells which do non go on to operate gametes can be classified asa. auxotrophic variancesb. somatic mutationsc. morphological mutationsd. onco constituentse. temperature clarified mutations3. What would be the frequency of AABBCC individuals from a mating of two AaBbCc individuals?a.. 1/64b. 1/32c. 1/16d. 1/8e. 3/16f. 1/44. The stage of meiosis in which chromosomes play off and cross over isa. prophase Ib. metaphase Ic. proph ase IId. metaphase IIe. anaphase II25. Polyploidy refers toa. unornamented copies of a gene close to each other(a) on a chromosomeb. an individual with complete extra sets of chromosomesc. a chromosome which has replicated but non sharedd. multiple ribosomes present on a single mribonucleic acide. an inversion which does not include the centromere6. A gene showing codominance-a. has both(prenominal) tot completelyyeles independently expressed in the heterozygoteb. has one allele dominant to the otherc. has alleles tightly coupled on the same chromosomed. has alleles expressed at the same time in readinge. has alleles that are recessive to each other7. The phenomenon of independent assortment refers toa. expression at the same stage of developmentb. unlinked transmission of genes in crosses resulting from being located on different chromsomes, or far apart on the same chromosome.c. association of an RNA and a protein implying colligate functiond. independent location of genes from each other in an interphase celle. association of a protein and a desoxyribonucleic acid sequence implying related function8. Mendels law of segregation, as applied to the behavior of chromosomes in meiosis, operator thata. pairing of homologs forget convert one allele into the other, leading to time interval of the types.b. alleles of a gene separate from each other when homologs separate in meiosis I, or in meiosis II if there is a single crossover between the gene and the centromere.c. genes on the same chromosome will show 50% recombinationd. alleles of a gene will be linked and passed on together with meiosis9. Which component of transcribed RNA in eukaryotes is present in the initial transcript but is remote before translation occursa. Intronb. 3&8242 Poly A tailc. Ribosome bandaging sited. 5&8242 cape. codons coding for the protein to be produced310. Choose the refuse statement about the genetic code.a. includes 61 codons for amino group acids and 3 deflect codonsb. almost universal exactly the same in most genetic systemsc. three bases per codond. some amino acids are coded by multiple codonse. all of the above11. X-chromosome inactivationa. normally takes trust in males but not femalesb. is the cause of the Y chromosome being genetically inactivec. takes place in humans so that the same X chromosome is inactive in all of the cells of a femaled. occurs in fruit flies but not in mammals e. results in genetically turning off one of the two X chromosomes in female mammals12. deoxyribonucleic acid ligase isa. an enzyme that joins fragments in normal deoxyribonucleic acid replicationb. an enzyme involved in protein synthesisc. an enzyme of bacterial origin which cuts DNA at defined base sequencesd. an enzyme that facilitates transcription of specific genese. an enzyme which limits the level to which a finicky nutrient reaches13. An Hfr strain of E. coli containsa. a vector of yeast or bacterial origin which is used to make many copies of a particular DNA sequenceb. a bacterial chromosome with a human gene insertedc. a bacterial chromosome with the F factor insertedd. a human chromosome with a transposable element insertede. a bacterial chromosome with a phage inserted414. An taste was conducted in E. coli to social occasion the following genes (pro, his, bio, met, phe and trp) on a circular map using 3 different Hfr strains.Strain 1 Order of enthrall (early to late) trp met his proStrain 2 Order of transfer (early to late) his met trp bioStrain 3 Order of transfer (early to late) pro phe bio trpBased on the results what is the most in all probability map? a. b. c. d.15. Generation of antibody diversity in vertebrate animals takes place through a. the presence of as many genes in the germ line as there are types of antibodies possible.b. infection with bacteria carrying antibody genesc. infection with viruses carrying antibody genesd. polyploidy in antibody-forming cellse. rearrangement of DNA in tissues that go on to produce antibodies16. Replication of DNA a. takes place in a conservative mannerb. takes place in a dispersive mannerc. takes place in a semi-conservative mannerd. unremarkably involves one origin of replication per chromosome in eukaryotese. takes place only in the 3&8242 to 5&8242 direction trp pro his phe met bio trp pro bio met phe his phe met bio pro trp his trp pro met bio phe his517. A duplication isa. an exchange between non-homologous chromosomes, resulting in chromosomes with new genes adjacent to each other.b. loss of genes in part of a chromosome c. an extra likeness of the genes on part of a chromosomed. a reversal of order of genes on a chromosomee. an extra set of chromosomes in an organism18. What is the co-transduction frequency for the A and B genes, from the following dataset? (Assume that there has been selection for the A+ form of the A gene).Genotype Number A+B+ C+ 10 A+B+ C- 30 A+ B- C+ 20 A+ B- C- 40a. .10b. .20c. .30d. .40e. .50 19. A mutation in a codon leads to the substitution of one amino acid with another. What is the name for this type of mutation?a. nonsense mutationb. missense mutationc. frameshift mutationd. promoter muttione. operator mutation20. Mapping of human chromosomesa. has been limit to the sex chromosomes because of small family sizesb. proceeded much more successfully as jumbo numbers of DNA markers became available.c. has determined that the number of linkage groups is about twice the number of chromosomesd. has demonstrated that almost all of the DNA is involved in coding for genese. has shown that there are more genes on the Y than on the X chromosome6