Animal Genetics and Breeding Quiz 28 Quiz InstructionsThis quiz consists of 22 multiple-choice questions.You will be awarded 5 marks for each correct answer. Question 1: A cross between two true breeding lines one with dark blue flowers and one with height white flowers produces F1 offspring that are light blue. When the F1 progeny are selfed a 1:2:1 ratio of dark blue to light blue to white flowers is observed. What genetic phenomenon is consistent with these results?EpistatsisIncomplete dominanceCodominanceInbreeding depression Question 2: Mutations which occur in body cells which do not go on to form gametes can be classified asAuxotrophic mutationsSomatic mutationsMorphological mutationsOncogenes Question 3: What would be the frequency of AABBCC individuals from a mating of two AaBbCc Individuals?1/641/321/161/8 Question 4: The stage of meiosis in which chromosomes pair and cross over isProphase IProphase IIMetaphase IIAnaphase II Question 5: Polyploidy refers toExtra copies of a gen adjacent to each other on a chromosomeAn individual with complete extra sets of chromosomes, A chromosome which has replicated but not dividedMultiple ribosomes present on a single mRNA Question 6: A gene showing codominanceHas both alleles independently expressed in the heterozygoteHas one allele dominant to the otherHas alleles tightly linked on the same chromosomeHas alleles expressed at the same time in developement Question 7: The phenomenon of ' Independent assortment' refers toExpression at the same of developmentUnlinked transmission of genes in crosses resulting from being located on different chromosomes,or far apart on the same chromosomeAssociation of an RNA and a protein implying related functionIndependent location of genes from each other in an interphase cell Question 8: Mendel's law of segregation, as applied to the behaviour of chromosomes in meiosis,means thatPairing of homologs will convert one allele into the other, leading to separation of the typesAlleles of a gene separate from each other when homologs separate in meiosis I, or in meiosis II. if there is a single crossover betwthe gene and the centromereGenes on the same chromosome will show 50% recombinationAlleles of a gene will be linked and passed on together through meiosis Question 9: Which component of transcription RNA in eukaryotes is present in the initial transcript but is removed before translation occursIntron3' poly A tailRibosome binding site5' cap Question 10: Choose the correct statement about the genetic codeAlmost universal, exactly the same in most genetic systemThree bases per codonSome amino acids are coded by multiple codonsAll of the above Question 13: DNA ligase is:an enzyme that joins fragments in normal DNA replication an enzyme involved in protein synthesis an enzyme of bacterial origin which cuts DNA at defined base sequencesan enzyme that facilitates transcription of specific genes Question 16: Generation of antibody diversity in vertebrate animals takes place through:infection with viruses carrying antibody genesinfection with bacteria carrying antibody genespolyploidy in antibody-forming cellsrearrangement of DNA in tissues that go on to produce antibodies Question 17: Replication of DNA:takes place in a “conservative” mannertakes place in a “dispersive” mannertakes place in a “semi-conservative” mannerusually involves one origin of replication per chromosome in eukaryotes Question 18: A duplication is: an exchange between non-homologous chromosomes, resulting in chromosomes with new genes adjacent to each other.loss of genes in part of a chromosomean extra copy of the genes on part of a chromosomea reversal of order of genes on a chromosome Question 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?nonsense mutationmissense mutationframeshift mutation promoter muttion Question 20: Mapping of human chromosomes:has been restricted to the sex chromosomes because of small family sizesproceeded much more successfully as large numbers of DNA markers became available.has determined that the number of linkage groups is about twice the number of chromosomeshas shown that there are more genes on the Y than on the X chromosome Question 21: Homeobox sequencesare present in the genome of many animal speciesare found in prokaryotes but not in eukaryotesare found in prokaryotes but not in eukaryoteswere identified as the integration sites for bacterial virusesrepresent integration sites for transposable elements Question 22: Tracing of a cell lineage during development means that:the cells giving rise to and derived from a specific cell are knownthe sequence of the enhancers for developmental genes is knownthe regulatory genes for the organism have been genetically mappedcell components in the nucleus involved in signaling have been isolated
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