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You have generated three transgenic lines of maize that are resistant to the European corn borer, a significant pest in many regions of the world. The transgenic lines (T
Explain these segregation ratios.
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GENETIC ANALYSIS: AN INTEG. APP. W/MAS
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- pZERO®-1 is a 2808 bp cloning vector from Invitrogen. This vector allows effective selection of positive recombinants via disruption of the lethal gene, ccdB. Besides the lethal gene, it has an additional Zeocin resistance gene for tighter screening control. The Zeocin resistance gene in this vector is certainly more advantageous over ampicillin resistance gene. Give its THREE (3) advantages.arrow_forwardWhat do you know about transgenic crops. Explain in detail with examples.arrow_forwardA shuttle vector is a vector (usually a plasmid) constructed so that it can propagate in two different host species. One of the most common types of shuttle vectors is the yeast shuttle vector. Examples of such vectors derived from yeast are Yeast Episomal Plasmid (YEp), Yeast Integrating Plasmid (YIp) and Yeast Replicating Plasmid (YRp). Among these three vectors, YIp has the lowest transformation frequency and copy number per cell. Explain why Ylp is still popularly used despite its limitations.arrow_forward
- Bacteriophage P22 was used in generalised transduction experiments to infect the Salmonella typhimurium donor strains described in the table below. The resulting phage lysates were then used to infect the recipient strains of S. typhimurium recipient strains listed in the table. In each cross, a phenotype was selected for one of the selected for one of the three genetic markers studied (str, aceA, thrA), and were made to select the recombinants corresponding to the other two markers. markers. The results are given in the following table: Strain I donor str thrA aceA thrA str aceA+ Strain recipient strs thrA+ aceA thrA str aceA Phenotype selected Str Ace+ Str recombinants selected ThrA ThrA ThrA ThrA Ace Ace Number 60 40 95 5 10 90 str: gene involved in streptomycin resistance, aceA: gene involved in the use of acetate as a carbon source, thrA: gene involved in threonine biosynthesis. 1) What are the selective media used in these three transduction experiments? to obtain the selected…arrow_forwardDraw a diagram/figure to explain the conjugation process (e.g. use PowerPoint or draw one by hand and include a photo of it). You should include in the diagram the F- recipient, Hfr Donor and the transconjugant/recombinant recipient. Make sure to include the genes encoding for Leucine, Threonine, Thiamine and Streptomycin resistance in your diagram. How does an Hfr strain of coli transfers chromosomal DNA to an F- strain? What determines how much of the chromosomal DNA is transferred?arrow_forwardDNA from a strain of Bacillus subtilis with genotype a+ b+ c+ d+ e+ is used to transform a strain with genotype a– b– c– d– e–. Pairs of genes are checked for co-transformation and results shown below are obtained. Based on these results, what is the order of the genes on the bacterial chromosome? please show how you worked out the order by diagraming, thank you! Pair of genes Co-transformation a+ and b+ no a+ and c+ no a+ and d+ yes a+ and e+ yes b+ and c+ yes b+ and d+ no b+ and e+ no c+ and d+ no c+ and e+ yes d+ and e+ noarrow_forward
- Bacteriophage P22 was used in generalized transduction experiments to infect the Salmonella typhimurium donor strains described in the table below. The resulting phage lysates were then used to infect the S. typhimurium recipient strains listed in the table. In each cross, a phenotype was selected for one of the three genetic markers studied (str, aceA, thrA), and then replicates were performed to select the corresponding recombinants for the other two markers. The results are given in the following table: Recipient strain Selected phenotype Selected recombinants Donor strain str thrA aceA+ thrA str aceA+ strs thrA+ aceA thrA+ str aceA Str Ace+ Str ThrA ThrA+ ThrA ThrA+ Ace Ace str: gene involved in streptomycin resistance, aceA gene involved in the use of acetate as a carbon source, thrA: gene involved in the biosynthesis of threonine. Number 60 40 95 5 10 90 Determine the order of the genes and draw a genetic map showing this orderarrow_forwardThe human gene for hemophilia is on the X chromosome. Below is a pedigree from a family afflicted with hemophilia. The man with blackened symbol (III-1) has hemophilia. To help with genetic diagnosis, a probe that detects an RFLP (restriction fragment length polymorphism) on the X chromosome is used. This probe detects either a 7 kb restriction enzyme fragment or 3 kb and 4 kb restriction enzyme fragments. The RFLP pattern for all the members of the pedigree is shown. The recombination distance between the RFLP and the hemophilia locus is 40%. What is the chance that their unborn child (III-7) is affected? 4 kb 3 kb Select one: a. 10% b. 20% C. 40% d. 60% e. 80% f. 90% g. None of these above II IIarrow_forwardThe gel below shows results for the bitter tasting SNP analysis from a CH306 class from a few years ago. Analyze the results and annotate the gel to indicate the bitter tasting ability and homozygous/heterozygous status of each of the individuals represented on the gel. There are three lanes of markers, and the first non-maker lane on the left of the gel is an uncut control PCR product (i.e. there are a total of 10 individuals on the gel starting in lane 3).arrow_forward
- a. Bacteriophage P22 was used in generalized transduction experiments to infect the Salmonella typhimurium donor strains described in the table below. The resulting phage lysates were then used to infect the S. typhimurium recipient strains listed in the table. In each cross, a phenotype was selected for one of the three genetic markers studied (str, aceA, thrA), and then replicates were performed to select the corresponding recombinants for the other two markers. The results are given in the following table: Recipient strain Selected phenotype Selected recombinants Donor strain str thrA aceAt thrA str aceA+ strs thrA+ aceA thrA+ str aceA Str Ace+ Str ThrA ThrA+ ThrA ThrA+ Ace Ace+ str: gene involved in streptomycin resistance, aceA: gene involved in the use of acetate as a carbon source, thrA: gene involved in the biosynthesis of threonine. Number 60 40 95 5 10 90 What are the selective media used in these three transduction experiments, on the one hand to obtain the selected…arrow_forwardScientists modified the tumor-inducing (Ti) plasmid, a naturally occurring plant plasmid found in Agrobacterium tumefaciens, to create a tool used to introduce any gene of interest into plant cells. They created a binary system because a single Ti plasmid is too large to be easily manipulated. One part of the system is a disarmed plasmid, and the second part is a transformation vector. The following sentences describe the function of key DNA elements in the system. Virulence region Genes for conjugative transfer Disarmed Ti plasmid (T-region removed) ori Kan selectable marker plant selectable marker constitutive promoter T-region conjugative transfer virulence Kan (bacterial selectable marker) Amp selectable marker Plant selectable marker (e.g., herbicide resistance) Constitutive promoter T-DNA left border Place the terms in the appropriate blanks to complete the sentences. Not all terms will be used. 3' transcriptional terminator MCS (inserted gene of interest) T-region Transformation…arrow_forwardThe temperature at which the primers and target DNA hybridize may be changed to influence the stringency of PCR amplification. What effect will changing the hybridization temperature have on the amplification? Let's say you have a certain yeast gene A and want to check whether it has a human equivalent. How might managing the hybridization's rigor benefit you?arrow_forward
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