18. Male bowerbirds construct elaborately decorated nests, or bowers. Basing their judgment on the fact that different local populations of bowerbirds of the same species build bowers that exhibit different building and decorative styles, researchers have concluded that the bowerbirds’ building styles are a culturally acquired, rather than a genetically transmitted, trait.
Which of the following, if true, would most strengthen the conclusion drawn by the researchers?
(A) There are more common characteristics than there are differences among the bower-building styles of the local bowerbird population that has been studied most extensively.
(B) Young male bowerbirds are inept at bower-building and apparently spend years watching their elders before becoming accomplished in the local bower style.
(C) The bowers of one species of bowerbird lack the towers and ornamentation characteristic of the bowers of most other species of bowerbird.
(D) Bowerbirds are found only in New Guinea and Australia, where local populations of the birds apparently seldom have contact with one another.(B)
(E) It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.
题目说: Male bowerbirds 筑的窝很精致,同一品种的,不同地方的bowerbirds 筑的窝都不一样,结论,bowerbird的建筑风格是由习惯决定的,不是由遗传决定的
找支持;
正确答案B,小鸟生来不会筑巢,是跟父亲学的
不明白的地方:这个与culturally ruquired 有什么关系?好像只是支持一个部分;不是由遗传决定的
疑惑选项D:不同地方的鸟不联系 想知道D为什么不对?
|