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Q. A cross is finished between 2 E. coli strains: Hfr arg+ bio+ leu+ (x) F- arg- bio- leu-. Interuppted mating studies explain that arg+ enteres the recipient last, so arg+ recombinants are selected on a medium containing bio and leu only. The recombinants are tested for the presence of bio+ and leu+. The following numbers of individuals are found for each genotype:
arg+ bio+ leu+ 320arg+ bio+ leu- 8arg+ bio- leu+ 0arg+ bio- leu- 48
What is the gene order? What are map distances in recombination units?
Two types of signals have been implicated in metaphase checkpoint arrest. Consider the results of a recent experiment in which the unattached kinetochore of a monoattached chromosome was destroyed by a laser beam.
While the nurse applies the sharp point of the pin on his arm several times, he is only able to identify these as one "very sharp prick." What would be the most correct explanation for this.
Which of these statements is true about meiosis? DNA is not replicated during meiosis. DNA is replicated before the first division, but is not replicated before the second division.
Assume you make buffer solution by adding four gram sodium bicarbonate to 270 milliliters of water then titrate this solution to 30 ml of 0.1 molar HCl and find the equilibrium equation for this base/acid pair.
An element that commonly forms covalent bonds is Carbon. Give an example of a compound containing Carbon that is formed by covalent bonds. Explain the structure and how many bonds hold each element together. What are compounds that involve only hy..
Assume that the trihybrid cross MM SS tt X mm ss TT is made in a plant species in which M and S are dominant but there is no dominance between T and t.
A 20 year old garden presents to his family for treatment of what he described as poison ivy. The patient hand and arm appear red and are covered with oozing blisters and crusts. Which of the following best describes the pathogenesis of this skin ..
The agouti locus in mice has three alleles: a is recessive and confers a black coat, A is dominant to a and confers an agouti coat, and AY is dominant to both and confers a yellow coat.
How is geological energy different from biological energy. Charlie has the blood test that shows a normal level of LDLs other than an elevated level of HDLs in his blood. Because his family has a history of cardiovascular disease, he wonders if he mu..
Over the long period of time that life has existed on Earth, there have been a number of important or significant innovations including (but not limited to) endosymbiosis to create mitochondria and chloroplasts.
Two substances in the glass beaker chemically react, and the glass beaker becomes too hot to touch, if the two substances are defined as the system, what constitutes the surroundings.
In Drosophila the genes for wing size and bristle length phenotypes long or short are inherited independently.
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