Amouse from a true-breeding population with normal gait was crossed to a mouse displaying an odd gait called "dancing." the f1 animals all showed normal gait. a. if dancing is caused by homozygosity for the recessive allele of a single gene, what proportion of the f2 mice should be dancers? b. if mice must be homozygous for recessive alleles of both of two different genes to have the dancing phenotype, what proportion of the f2 should be dancers if the two genes are unlinked? c. when the f2 mice were obtained, 42 normal and 8 dancers were seen. use the chi-square test to determine if these results better fit the one-gene model from part a or the two-gene model from part b.

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.

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.

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.