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Time of entry mapping between a streptomycin-sensitive, prototrophic Hfr strain and a streptomycin- resistant Fminus strain that was Trp- Pyr- Cys- Nic- did not allow the order of the trp,pyr,cys genes to be determined, but these three genes were always transferred before nic. To determine the relative order of the trp,pyr,cys genes and the distances between them, the Hfr and Fminus strains were mated long enough to allow the transfer of the nic gene, after which Trp+ recombinants were selected. The unselected pyr and cys genes were then scored in the Trp+ recombinants , yielding the following results:
phenotype number of recombinantsTrp+ Pyr+ Cys+ 790Trp+ Pyr+ Cys- 145Trp+ Pyr- Cys+ 60Trp+ Pyr- Cys- 5
Draw a map of the trp, pyr, cys genes relative to each other.Express map distances between adjacent genes as the frequency of crossing over between them.
Explain how physical and chemical laws affect a living organism. Explain ow an organism has evolved to adapt to its physical or chemical environment. Then answer: who do you think physical and chemical laws relate functions to structures and vice ..
q. 1. in the united states traffic drives on the right side of the road. in britain traffic drives on the left side of
DATA TO USE FOR FIGURE:Concentration (ug/g) of a PCB congener for orca whales.Males at 5, 6, 7, 8, 9, 10 years old have the following concentrations (1.5, 3.0, 4.5, 7.0, 9.0 , 12.0), respectively. Concentrations for females for the same respective ag..
How the cell overcomes misfolded soluble or secretory proteins in the RER by exporting the misfolded proteins out of the RER into the cytosol, where they are degraded in the proteasome.
Henri tested the effects of a blood pressure reducing drug and found that blood pressure dropped significantly in those treated but did not change in an untreated control group. What is a reasonable conclusion from this experiment?
In the figure below, suppose the left-hand individual is selfed. What pattern of radioactive bands would you see in a Southern analysis of the progeny?
The patient was discharged from the hospital 10 days later. As the discharging nurse, list three medical issues you would advise this patient to attend to. List the issues in the order of importance: from most to least.
In fruit flies the gene (b) for black body is recessive to itsallele for gray. The gene (h) for hairy body is recessive for itsallele for wild type. A gray, wild-type female was crossed with ablack, hairy male.
What was the incidence rate of lyme disease in Chittenden County in 1994? What type of incidence rate is this?
Discuss how the unique physical and chemical properties of water contribute to the importance of water for life on Earth to survive. Explain the role so called "accidental" discoveries played in the history of science.
In tomatoes, the three mutant traits, dwarfness, green flesh, and white flowers, are due to the homozygous recessive state of the genes d, gf, and wf (respectively). A dwarf, green-fleshed, white-flowered plant is crossed as the pollen parent to t..
Explain the principle of natural selection, Explain how radiometric dating and the fossil record support the theory of evolution
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