In the ames test, the appearance of his+ revertants in the presence of a non-mutagenic control compound indicates that the growth medium contains factors that are mildly mutagenic there is some low-level contamination in most experiments liver extract increases the potency of some mutagens some of the reversion mutations are not caused by the mutagen being tested

Which are observations about the tree on the right ,? check all that apply

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Punnett squares are used to show possible combinations of alleles or to predict the probability of a trait occurring in offspring. an incomplete dominance cross is performed between a bird that is homozygous for red feathers and a bird that is homozygous for blue feathers. purple offspring result. then, two of the purple offspring are crossed. according to the punnett square for this cross, how many of the offspring from the second cross will have a feather color that results from incomplete dominance? 1 in 4 2 in 4 3 in 4 4 in 4