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- the evolutionary relationship between mode O Humans are descended from chimpanzees O Humans and chimpanzees had a common ancestor several millior ears ago Humans and chimpanzees had a common ancestor several million years ago; sinc Chimpanzees are more closely related to gorillas than they are to humans QUESTION 2 Which of the following statements about hominins is FALSE? ALS Each hominin species on Earth was directly descended from the species that preced Multiple hominin species lived at the same time The genus homo arose about 2.5 million years ago We have now discovered a vast number of hominin fossils, allowing us to trace the e QUESTION 3 Which of the following are ways in which early hominins differed from apes? (select alInsects have three thoracic (trunk) segments. While researchershave found insect fossils with pairs of wings on all threesegments, modern insects have wings or related structureson only the second and third segment. It turns out thatin modern insects, Hox gene products act to inhibit wingformation on the first segment. The treehopper insect (above)is somewhat of an exception. In addition to having wingson its second segment, the treehopper’s first segment has anornate helmet that resembles a set of thorns, which a recentstudy has found to be a modified, fused pair of “wings.” Thethorn-like structure helps to camouflage the treehopper intree branches, thus reducing its risk of predation. Explain howchanges in gene regulation could have led to the evolution ofsuch a structure.Microtaxonomy ( Species and Speciation ) People who do not believe in evolution often cite the classic example of man presumably evolving from the apes. They oftern ask: if humans evolved from apes, why are there apes until today? How will you provide a convincing answer that there is no contradiction in the existence of apes and humans at the same time?
- . The upper forelimbs of humans and bats have fairly similarskeletal structures, whereas the corresponding bones inwhales have very different shapes and proportions. However,genetic data suggest that all three kinds of organisms divergedfrom a common ancestor at about the same time. Which ofthe following is the most likely explanation for these data?(A) Forelimb evolution was adaptive in people and bats, butnot in whales.(B) Natural selection in an aquatic environment resulted insignificant changes to whale forelimb anatomy.(C) Genes mutate faster in whales than in humans or bats.(D) Whales are not properly classified as mammals.In studying recent fossils of the genus Homo, such as Cro-Magnon,biologists have determined that modern humans have not undergonemuch biological evolution in the past 50,000 years. Rather, culturalanthropologists argue that cultural evolution has been far moreimportant than biological evolution in the recent history of modernhumans. What do they mean by this? Support your argument withsome examples.Homologous structures are evidence that O That the animals probably share a common ancestor O That all animals probably came from each other O That all animals probably share the exact same DNA O That all the animals are unrlated
- Full or partial limblessness has evolved many times invertebrates (snakes, lizards, manatees, whales). Do youexpect the mutations that occurred in the evolution oflimblessness to be in the coding or noncoding sequencesof toolkit genes? Why?In 1798, a stuffed platypus specimen was delivered tothe British Museum. Reports that it laid eggs createdmuch confusion. To modern biologists, a platypus isclearly a mammal. It has fur and the females producemilk. Young animals have typical mammalian teeth thatare replaced by hardened pads of the “bill” as the animalmatures. Why do you think modern biologists can moreeasily accept that a mammal can have some reptileliketraits than scientists who were considering this animal inthe late 1700s?Recent reconstructions of evolutionary history are often dependenton assigning divergence in terms of changes in amino acid ornucleotide sequences. For example, a comparison of cytochromec shows 10 amino acid differences between humans and dogs,24 differences between humans and moths, and 38 differencesbetween humans and yeast. Such data provide no information asto the absolute times of divergence for humans, dogs, moths, andyeast. How might one calibrate the molecular clock to an absolutetime clock? What problems might one encounter in such acalibration?
- What must be TRUE of any organ described as vestigial? It need be neither homologous nor analogous to some feature in an ancestor. O It must be analogous to some feature in an ancestor. O It must be homologous to some feature in an ancestor. OIt must be both homologous and analogous to some feature in an ancestor.Sometimes biologists are alleged to have said that "man came from monkeys." The correct way for a modern biologist to explain the apparent sequence of human evolution is: None of these is an accurate explanation. O humans and monkeys are biologically identical. O humans and monkeys share a common ancestor. evolution leads toward more perfect forms and humans therefore came after modern monkeys. monkeys have evolved less than humans.Muscles that make hair stand Saln of ogre ssion, cooing helps heep Hae bady wanm. estra Support for walkuley Iensling banes and tred Únbs up Little toe Wisdom teeth Leadlay 8. Select ONE of the vestigial structures above mentioned and propose a hypothesis as to why it was "lost" in evolution. IF a human does/does not use THEN BECAUSE 9. Explain why the homologous structure of the bones are evidence for evolutionary relationship 10. Explain the relationship using comparative anatomy information above between the fin of a fish, the flipper of a whale, and the wing of an airplane. 11. Describe how you think vestigial structures came about.