gre考试阅读真题解析(A)
equal numbers of exclusively left-and right-handed broods
an increasing occurrence of left-handedness in successive broods
26. It can be inferred from the passage that a predominantly sinistral snail species might stay predominantly sinistral for each of the following reasons EXCEPT for
a developmental mechanism that affects the cell-division pattern of snails
structural features that advantage dextral snails of the species
a relatively small number of snails of the same hand for dextral snails of the species to mate with
anatomical incompatibility that prevents mating between snails of opposing hands within the species
geographic separation of sinistral and dextral populations
27. Which of the following accurately describes the relationship between the evolutionary and developmental theories discussed in the passage?
Although the two theories reach the same conclusion, each is based on different assumptions.
They present contradictory explanations of the same phenomenon.
The second theory accounts for certain phenomena that the first cannot explain.
The second theory demonstrates why the first is valid only for very unusual, special cases.
They are identical and interchangeable in that the second theory merely restates the first in less technical terms.
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