chapter 22

which of the five common ancestors labeled V-Z has given rise to the greatest number of species both extant and extinct?

X

If two modern organisms are distantly related in an evolutionary sense, then one should expect that..

they should share fewer homologous structures

which statement about natural selection is most correct?

well-asapted individuals leave more offspring and thus contribute more to the next generation's gene pool than do poorly adapted individuals

given a population that contains genetic variation what is the correct sequence of the following events under the influence of natural selection?

2-4-1-3

If 3TC resistance is costly for HIV....

3

the trees horizontal axis... (graph)

6

if "x" indicates the location of fossils of two closely related species the fossil of their most recent common ancestor are more likely to occur in which stratum?

C

which stratum should contain the greatest proportion of extinct organism?

D

charles Darwin was the first person to propose ...

a mechanism for evolution that was supported by evidence

which of the following must exist in a population before natural selection can act upon that population?

genetic variation among individuals

Natural selection is based on all of the following except...

individuals adapt to their environments and thereby evolve

In Darwin's thinking the more closely related two different organisms are the...

more recently they shared a common ancestor

DDT was considered a silver bullet that would permanently eradicate insect pest....

none of the individuals insects should have possessed genomes that made the resistant to DDT

which statement best describes the evolution of pesticide resistance in a population of insects?

offspring of insects that are genetically resistant to the pesticide become more abundant as susceptible insects die off

During a study session about evolution one of your fellow students remarks, " The giraffe stretched its neck while reaching for higher leaves; its offspring inherited longer necks as a result' which statement is most likely to be helpful in correcting this students misconception?

only favorable adaptations have survival value

which of the following represents an idea that Darwin learned from the writing of Thomas Malthus?

populations tend to increase at a faster rate than their food supply normally allows

In a hypothetical enviornment.....

selection for larger female algae eaters bearing broods composed of more and learner young