The Following Questions Refer to the Evolutionary Tree in Figure

question 66

Multiple Choice

The following questions refer to the evolutionary tree in Figure 22.4,whose horizontal axis represents time (present time is on the far right) and whose vertical axis represents morphological change.
Figure 22.4
-Which conclusion can be drawn from this evolutionary tree?

• A)Gradualistic speciation and speciation involving punctuated equilibrium are mutually exclusive concepts.
• B)Eldredge and Gould would deny that the lineages labeled X,Y,and Z could represent true species.
• C)Assuming that the tip of each line represents a species,there are five extant (that is,not extinct)species resulting from the earliest common ancestor.
• D)A single clade (that is,a group of species that share a common ancestor)can exhibit both gradualism and punctuated equilibrium.

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Definitions:

Family History

The health and medical histories of relatives, which can indicate an individual's risk for certain genetic or hereditary conditions.

Frequency

In psychology, often refers to the rate at which a behavior occurs within a certain period of time, important in the study of behavior patterns.

Prognosis

The anticipated progression or outcome of a patient's condition based on current knowledge and trends.

Natural Course

The progression and outcomes of a condition or disorder without medical or therapeutic intervention.