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You have identified a mutant E. coli strain that cannot synthesize histidine (His-).To determine the location of the his- mutation on the E. coli chromosome, interrupted mating experiment was performed with 5 different Hfr strains. The following chart shows the time of entry (minutes, in parentheses) of the wild-type alleles of the first 5 markers (mutant genes) into the His- strain.
Hfr A -------- his (1) man (9) gal (28) lac (37) thr (45)Hfr B -------- man(15) his (23) cys (38) ser (42) arg (49)Hfr C -------- thr (3) lac (11) gal (20) man (39) his (47)Hfr D -------- cys (3) his (18) man (26) gal (45) lac (54)Hfr E -------- thr (6) rha (18) arg (36) ser (43) cys (47)
On the map below of the circular E. coli chromosome, indicate:
a. the relative location of each gene
b. the position where the sex factor is integrated in each of the five Hfr strains
c. the direction of chromosome transfer for each Hfr (indicate direction with an arrow).
Few decades ago, most population geneticists believed that populations are genetically uniform, except for rare deleterious mutations.
Determine which of the following is examples of disruptive selection and which of the following describes balancing selection.
What could be expected phenotypes, and in what number will the y be expected? Suppose no linkage.
What are the dissimilar types of energy we learned about it. Recognize one technique presently being used to alter the genetic makeup of an organism, and explain how humans can advantage from this change.
The table presents the rates of reaction at specific substrate concentrations for an enzyme that displays classical Michaelis-Menten kinetics. Two sets of inhibitor data are also included.
Can someone explain replica plating in detail regarding xgal and xgal + iptg? I am studying for an exam and am very confused. I have in my notes something about mutations turn xgal +iptg blue when its supposed to be white and wild type should be x..
The Km represents the substrate concentration that will cause an enzyme to be at half maximal velocity.
we know that natural selection will not result in evolution if a trait is not heritable. However, it is also possible that a trait with heritable variation will not show an evolutionary response under natural selection.
Lost supplies for the and not enough time before due date to start now takes seven days of observation, does anyone have this data?
To understand how energy could be flowing in this aquatic ecosystem, list the different autotrophic and heterotrophic organisms found at each pond, and explain its role in energy flow through the system.
Gennie is wild type. Below is a segment of her DNA. The top strand is the coding region, and the reading frame begins with the first codon that codes for met
Assume that flower color is inherited by simple dominance and that red flowers are dominant to white flowers.
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