Genetics 301 Sample Final Examination

Genetics 301 Sample Final Examination jet 2003 50 Multiple Choice Questions(Choose the best answer)1. A cross in the midst of two true breeding lines iodin with dark deplorable flowers and one with bright white flowers produces F1 offspring that be light blue. When the F1 progeny are selfed a 121 ratio of dark blue to light blue to white flowers is observed. What brokertic phenomenon is consistent with these results?a. epistasisb. sketchy dominancec. codominanced. inbreeding depressione. random mating2. Mutations which occur in frame cells which do not go on to form gametes can be classified asa. auxotrophic alterationsb. somatic mutationsc. morphological mutationsd. oncobrokerse. temperature sensitive mutations3. What would be the frequence 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 chromo some(prenominal)s pair and cross all over isa. prophase Ib. metaphase Ic. prophase IId. meta phase IIe. anaphase II25. Polyploidy refers toa. free copies of a gene adjacent to each other on a chromosomeb. an individual with perfect(a) extra sets of chromosomesc. a chromosome which has replicated but not dividedd. multiple ribosomes insert on a single mRNAe. an inversion which does not complicate the centromere6. A gene showing codominance-a. has both alleles independently denotative in the heterozygoteb. has one allele dominant to the otherc. has alleles tightly tie in on the same chromosomed. has alleles expressed at the same time in developmente. has alleles that are recessive to each other7. The phenomenon of independent variety refers toa. expression at the same stage of developmentb. unlinked transmission of genes in crosses resulting from being located on different chromsomes, or far isolated on the same chromosome.c. friendship of an RNA and a protein implying related roled. independent location of genes from each other in an interphase celle. association o f a protein and a deoxyribonucleic acid epoch implying related function8. Mendels police of segregation, as applied to the behavior of chromosomes in meiosis, means thata. pairing of homologs entrust convert one allele into the other, leading to separation of the types.b. alleles of a gene separate from each other when homologs separate in meiosis I, or in meiosis II if in that respect is a single hybridization 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 through meiosis9. Which component of transcribed RNA in eukaryotes is enclose in the initial transcript but is removed before interpretation occursa. Intronb. 3 Poly A tailc. Ribosome binding sited. 5 cape. codons coding for the protein to be produced310. Choose the correct statement close the genetic code.a. includes 61 codons for amino acids and 3 stop codonsb. almost ecumenical 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 defusinga. normally takes place 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. DNA ligase isa. an enzyme that joins fragments in normal DNA replicationb. an enzyme obscure in protein synthesisc. an enzyme of bacterial radical which cuts DNA at delimitate base sequencesd. an enzyme that facilitates transcription of specific genese. an enzyme which limits the level to which a relegateicular alimentary reaches13. An Hfr strain of E. coli containsa. a vector of yeast or bacterial descent 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 portion insertede. a bacterial chromosome with a phage inserted414. An experiment was conducted in E. coli to single-valued function the side by side(p) genes (pro, his, bio, met, phe and trp) on a circular map using 3 different Hfr strains. tense up 1 Order of alter (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 likely map? a. b. c. d.15. genesis 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 conserva tive fashionb. takes place in a dispersive mannerc. takes place in a semi-conservative mannerd. usually involves one origin of replication per chromosome in eukaryotese. takes place only in the 3 to 5 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 duplicate isa. an exchange between non-homologous chromosomes, resulting in chromosomes with new genes adjacent to each other.b. hurt of genes in part of a chromosome c. an extra copy 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 compute 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 break for this t ype of mutation?a. nonsense mutationb. missense mutationc. frameshift mutationd. performer muttione. operator mutation20. Mapping of human chromosomesa. has been restricted to the sex chromosomes because of small family sizesb. proceeded much more successfully as large numbers of DNA markers became available.c. has determined that the number of linkage groups is about twice the number of chromosomesd. has show 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