Microsatellites are currently exploited as markers for paternity testing. A sample paternity test is shown in the following table in which ten microsatellite markers were used to test samples from a mother, her child, and an alleged father. The name of the microsatellite locus is given in the left-hand column, and the genotype of each individual is recorded as the number of repeats he or she carries at that locus. For example, at locus D9S302, the mother carries 30 repeats on one of her chromosomes and 31 on the other. In cases where an individual carries the same number of repeats on both chromosomes, only a single number is recorded. (Some of the numbers are followed by a decimal point, for example, 20.2, to indicate a partial repeat in addition to the complete repeats.) Assuming that these markers are inherited in a simple Mendelian fashion, can the alleged father be excluded as the source of the sperm that produced the child? Why or why not? Explain.
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Concepts of Genetics (12th Edition)
- As the leading scientist in a biomedical science laboratory, it is a requirement to give advice to your lab assistants when they are having problems with their experiments. What advice would you give to your assistants that are having the following problems: After performing a polymerase chain reaction (PCR) and agarose gel electrophoresis to confirm the presence of the C01 gene of 750bp. 2.1. They observe no band appearing on an agarose gel. What would be your conclusion? 2.2. They observe three bands of different sizes that resemble a smear on the gel. Advice 2.3. They observe a single band on the gel and conclude that the PCR product is an exact copy of the original template DNA. Would you support their condusion? Explain. 2.4. Explain how PCR can be used to detect infectious agents in diagnoses of diseases.arrow_forwardWhat is a recombinant vector? How is a recombinant vector constructed? Explain how X-Gal is used in a method of identifying recombinant vectors that contain segments of chromosomal DNA.arrow_forwardWhat is homologous recombination and where/when does it typically take place in an organism. Homologous recombination is also used experimentally during gene targeting. If you wanted to remove the function of the mouse gene fibroblast growth factor 4 (FGF4) using gene targeting by homologous recombination, what are the different aspects of a targeting vector you would need to make?arrow_forward
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- In cloning a specific fragment from a mixture of different fragments of DNA, three classes of plasmids can be produced: vector containing the desired fragment (gene of interest), vector containing other fragments, and re- ligated vector containing no inserted DNA. What class of vector would you expect to find at the highest frequency? Multiple Choice All three types of vector will be found in approximately equal proportions Vector containing random genomic DNA fragments Vector containing the gene of interest Vector with no insert wwarrow_forwardThe following figure shows the FBI-style analysis of the genomic DNA of 10 people (1-10), and also of hair found at a crime scence left by the murderer [***]. This analysis involves the PCR amplification of SSR loci, each from a different (nonhomologus) chromosome. The PCR primers are for each SSR locus are labeled with a unique fluorescent molecule. Some bands are thicker because relatively more of the corresponding PCR product was obtained. The figure has dots aligned on both sides to help you find the crucial bands; it will help to use a straight-edge as a guide. The numbers at right are the total number of copies of the SSR locus among the population of 11 samples. Are any of individuals 1-10 probable relatives of the murderer? If so, identify this person and describe the degree of relationship to the criminal.arrow_forwardThe following figure shows the FBI-style analysis of the genomic DNA of 10 people (1-10), and also of hair found at a crime scence left by the murderer [***]. This analysis involves the PCR amplification of SSR loci, each from a different (nonhomologus) chromosome. The PCR primers are for each SSR locus are labeled with a unique fluorescent molecule. Some bands are thicker because relatively more of the corresponding PCR product was obtained. The figure has dots aligned on both sides to help you find the crucial bands; it will help to use a straight-edge as a guide. The numbers at right are the total number of copies of the SSR locus among the population of 11 samples. e. What is the probability that any random male in USA would share the same genotype as the murderer (the match probability)? Assume that all 11 DNA samples analyzed in the diagram are together representative of the USA population as a whole. Show what numbers you would multiply to do this calculation.arrow_forward
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