In comparing the genomes of humans and those of other higher primates, it is seen that humans have a large metacentric pair we call chromosome #2 among our 46 chromosomes, while the other primates of this group have 48 chromosomes and any pair like the human #2 pair is not present; instead the primate groups each have two pairs of midsize acrocentric chromosomes. What is the most likely explanation?

#Question id: 4709

#Unit 11. Evolution and Behavior

 The horizontal axis of the cladogram depicted below is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V-Z) represent various common ancestors. Let's say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.

 In Darwin's tree of life, each fork in the tree represents ________.

#Question id: 4708

#Unit 11. Evolution and Behavior

The following questions refer to the figure below, which shows an outcrop of sedimentary rock whose strata are labeled A-D. If x indicates the fossils of two closely related species, neither of which is extinct, then their remains may be found in how many of these strata?

#Question id: 4707

#Unit 11. Evolution and Behavior

For which one of the following observations were both Lamarck's hypothesis and Darwin's hypothesis in complete agreement?

#Question id: 4706

#Unit 11. Evolution and Behavior

Which of the following statements best explains why modification or change in an organ or tissue during the lifetime of an individual is not inherited?

#Question id: 4705

#Unit 11. Evolution and Behavior

Darwin and Wallace's theory of evolution by natural selection was revolutionary because it ________.

#Question id: 4704

#Unit 11. Evolution and Behavior

About thirteen different species of finches inhabit the Galápagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago. Genetically, there are four distinct lineages, but the thirteen species are currently classified among three genera. The first lineage to diverge from the ancestral lineage was the warbler finch (genus Certhidea). Next to diverge was the vegetarian finch (genus Camarhynchus), followed by five tree finch species (also in genus Camarhynchus) and six ground finch species (genus Geospiza). If the six ground finch species have evolved most recently, then which of these is the most logical prediction?