Because dna evolves at a relatively steady rate, gene sequences in two different organisms will accumulate sequence changes and becoming more different with time. some genes are under more selection and so evolve more slowly. other genes evolve quite quickly. assuming that sites change linearly with time, we can calculate how many sites differ when comparing genes between different species. for simplicity we’ll assume each of these genes is 1000 bp long. species compared # of sites that vary when comparing 2 sequences ribosomal rna hemoglobin mitochondrial cytochrome b human and chimp 1 14 49 human and orangutan 3 32 112 human and gibbon 4 40 140 human and macaque 6 58 203 human and mouse 18 180 630
a. why do the three genes differ in the number of variable sites between different species

Where is the energy in a sucrose molecule stored? o a. inside the hydrogen atoms o b. inside the carbon atoms o c. in the bonds between the atoms o d. inside the protons

Where does all the water go? according to the environmental protection agency (epa), in a typical wetland environment, 39% of the water is outflow; 46% is seepage; 7% evaporates; and 8% remains as water volume in the ecosystem (reference: united states environmental protection agency case studies report 832-r-93-005). chloride compounds as residuals from residential areas are a problem for wetlands. suppose that in a particular wetland environment the following concentrations (mg/l) of chloride compounds were found: outflow, 60.4; seepage, 73.7; remaining due to evaporation, 26.4; in the water volume, 46.8. (a) compute the weighted average of chlorine compound concentration (mg/l) for this ecological system. (round your answer to one decimal place.) mg/l (b) suppose the epa has established an average chlorine compound concentration target of no more than 58 mg/l. does this wetlands system meet the target standard for chlorine compound concentration? yes. the average chlorine compound concentration (mg/l) is too high. yes. the average chlorine compound concentration (mg/l) is lower than the target. no. the average chlorine compound concentration (mg/l) is lower than the target. no. the average chlorine compound concentration (mg/l) is too high.

Zoo geographic regions are characterized by the presence of specific groups of animals these regions are determined by the taxonomic or phylogenetic relationships of animals. the map shows the zoogeographic regions proposed by the naturalist alfred russel wallace in 1876. the similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between the organisms in both locations ?