BIOChapter26

BIOChapter26 - not conserved Panthera not Canis familiaris

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Question 1 1 points Save Darwin analogized the effects of evolution as the above- ground portion of a many-branched tree, with extant species being the tips of the twigs. The common ancestor of two species is most analogous to which anatomical tree part? a single twig that gets longer with time a node where two twigs diverge a twig that branches with time the trunk neighboring twigs attached to the same stem Question 2 1 points Save The four-chambered hearts of birds and the four- chambered hearts of mammals evolved independently of each other. If one were unaware of this independence, then one might logically conclude that the common ancestor of birds and mammals had a three-chambered heart. birds and mammals are more distantly related than is actually the case. early mammals possessed feathers. the common ancestor of birds and mammals had a four-chambered heart. birds and mammals should be placed in the same class. Question 3 1 points Save Some molecular data place the giant panda in the bear family (Ursidae) but place the lesser panda in the raccoon family (Procyonidae). The morphological similarities of these two species must therefore be due to inheritance of acquired characteristics. sexual selection. inheritance of shared derived characters. convergent evolution. possession of shared primitive characters. Question 4 1 points Save Generally, within a lineage, the largest number of shared derived characters should be found among two organisms that are members of the same
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kingdom. class. domain. family. order. Question 5 1 points Save The camera-type eyes of octopuses are very complicated and have many of the same features as the camera-type eyes of vertebrates. Yet, the eyes of invertebrates and vertebrates are not homologous. This situation is an example of misalignment of sequences. homoplasy. substitution mutations.
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BIOChapter26 - not conserved Panthera not Canis familiaris

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