g An E. coli mutant is identified that contains a small deletion in the trp leader sequence. This mutation does not affect the ability of an RNA polymerase or a ribosome to bind to the trp operon, but it does prevent the formation of the 3:4 hairpin. Suppose you use genetic methods to move this mutation into an E. coli strain where the trp repressor trpR has been deleted already. What phenotype do you expect of the strain with a trpR deletion and the trp leader sequence mutation that prevents 3:4 hairpin formation

answer; i believe that the correct answer is(d) nondisjunction during meiosis;

b. lithosphere, asthenosphere, mesosphere   is the answer most likely

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.