Biology, 21.12.2019 05:31, nicoleh2015
An hfr strain of genotype: arg- lac- leu+ strs is mated with a recipient strain of genotype: arg+ lac+ leu- strr. the strs marker is known to be transferred very late. among the other three markers, leu+ is the last one to enter the f- cell. (note: all bacteria have the ability to utilize glucose as a sugar source. the alleles arg+and leu+ are necessary for synthesis of arginine and leucine respectively. the lac+ is necessary for utilization of lactose.)exconjugants are plated on a medium containing glucose, streptomycin, and arginine. the following results are obtained for 500 colonies isolated from these plates and tested for growth on various media: minimal medium (with glucose): 135 coloniesminimal medium (without glucose) + lactose: 85 coloniesminimal medium (without glucose) + lactose + arginine: 90 coloniesa) write a list of possible genotypes from those 500 colonies, and indicate the number in each genotype. show your work and circle your answer. provide a detailed explanation for each answer. b) calculate the recombination frequencies. show your work and circle your answer. provide a detailed explanation as to why those certain genotypes and numbers are used to calculate the recombination frequencies. i do not understand how the rf are calculated. c. ) what is the gene order? include the position of the origin of transfer.
Answers: 3
Biology, 22.06.2019 01:10, theojw
Determine if the following statement is true or false. if true, choose true. if false, choose the rewording that is true. according to the law of independent assortment, alleles for each gene are inherited together so that they always stay together. according to the law of independent assortment, offspring express a combination of their parents' traits. according to the law of independent assortment, alleles for a characteristic split during meiosis and combine during fertilization. true according to the law of independent assortment, alleles for each gene are inherited independently so that no two alleles stay together.
Answers: 1
Biology, 22.06.2019 06:00, maylindominguez
Which is an important function of normal flora? a. aid with bone marrow production. b. crowd out pathogenic bacteria. c. destroy digestive track pathogens. d. manufacture iron in the bloodstream.
Answers: 1
An hfr strain of genotype: arg- lac- leu+ strs is mated with a recipient strain of genotype: arg+...
Mathematics, 21.07.2020 05:01