RBBmba@2014 wrote: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 bowerbuilding styles of the local bowerbird population that has been studied most extensively.
B. Young male bowerbirds are inept at bowerbuilding 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.
E. It is well known that the song dialects of some songbirds are learned rather than transmitted genetically.
OA:B
P.S: Although I got this one right, I'd like to know why exactly Option D is wrong ?
@Verbal Experts - could you please share your analysis ?
Imagine that you're observing bowerbirds in New Guinea. You're examining the distinctive style of the nests of Population A and you're trying to settle a nature-nurture debate. Did these birds learn this style from other birds, or are they simply genetically programmed to build this way? If you already know that the nests in Population A are different from the nests in Population B, why would knowing that birds from A and B rarely interact help you settle this debate? If the nests are different, there was never any reason to suspect that the birds from Population A were learning anything from the birds from Population B. So within A , there are still two possibilities. Either some birds in A are learning their nest-making from other birds in A, and the trait is culturally acquired, or the birds in A are somehow genetically distinct from the birds in B, and it's the genes that dictate the style of the nests. D doesn't tell us this.