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

He did not infringe upon the policy making powers that he felt the constitution gave congress. but the determination of foreign policy became preponderantly a presidential concern. when the french revolution led to a major war between france and england, washington refused to accept entirely the recommendations of either his secretary of state thomas jefferson, who was pro-french, or his secretary of the treasury alexander hamilton, who was pro-british. rather, he insisted upon a neutral course until the united states could grow stronger. which provides the best objective summary of this excerpt? president washington made a good choice when he decided not to accept the recommendations of his advisors and instead insisted that the united states stay neutral during the war between france and england as president, washington believed that the united states should remain neutral in foreign policy even though he had advisors who recommended that he take sides during the war between france and england. washington did not make policy decisions during his presidency because he did not want to interfere with the policy-making powers that the constitution gave congress. washington refused to accept entirely the recommendations of either his secretary of state thomas jefferson, who was pro-french, or his secretary of the treasury alexander hamilton, who was pro-britis

Which statement describes characteristics of planarians? a they live in oceans, are parasites, and reproduce only sexually. b they live in fresh water, are parasites, and reproduce only asexually. c they live in oceans, are free living, and reproduce sexually and asexually. d they live in fresh water, are free living, and reproduce sexually and asexually.

During binary fission, what events must occur before the cell splits into two new cells?