Chapter 24 AP Biology – Flashcards
Unlock all answers in this set
Unlock answersquestion
The largest unit within which gene flow can readily occur is a
answer
species.
question
Males of different species of the fruit fly Drosophila that live in the same parts of the Hawaiian Islands have different elaborate courtship rituals. These rituals involve fighting other males and making stylized movements that attract females. What type of reproductive isolation does this represent?
answer
behavioral isolation
question
According to the punctuated equilibria model,
answer
most new species accumulate their unique features relatively rapidly as they come into existence, then change little for the rest of their duration as a species.
question
Bird guides once listed the myrtle warbler and Audubon's warbler as distinct species. Recently, these birds have been classified as eastern and western forms of a single species, the yellow-rumped warbler. Which of the following pieces of evidence, if true, would be cause for this reclassification?
answer
The two forms interbreed often in nature, and their offspring have good survival and reproduction
question
Which of the following factors would not contribute to al-lopatric speciation?
answer
Gene flow between the two populations is extensive.
question
Plant species A has a diploid number of 12. Plant species B has a diploid number of 16. A new species, C, arises as an allopolyploid from A and B. The diploid number for species C would probably be
answer
28
question
When gene flow between two populations ceases, the potential for _____ exists.
answer
speciation
question
Which species concept defines a species as a set of organisms with a unique genetic history?
answer
phylogenetic species concept
question
Sometimes two phenotypically different populations interbreed to a limited extent, so that it is difficult to determine whether they are clearly separate species. This is not a concern to scientists because this _____.
answer
may indicate that the formation of a new species is in progress
This could indicate that although a reproductive barrier is becoming established, it is not yet complete.
question
Which of the following evolutionary mechanisms does NOT contribute to the process of allopatric speciation?
answer
gene flow
question
In which of the following groups has sympatric speciation been most important?
answer
plants
question
A new species can arise in a single generation _____.
answer
if a change in chromosome number creates a reproductive barrier
question
allopatric speciation
answer
As the finches spread out to different islands and became isolated from each other, gene flow between them ceased, and new species arose.
question
According to the punctuated equilibrium model of evolution, _____.
answer
the tempo of evolution consists of abrupt episodes of speciation among long periods of equilibrium
question
Comparison of human fossils with living humans seems to show that there have been no significant physical changes in Homo sapiens in 30,000 to 50,000 years. What might an advocate of punctuated equilibrium say about this?
answer
Lack of change is consistent with the punctuated equilibrium model.
question
What is the first thing that must happen in order for speciation to occur?
answer
Gene flow between populations must be interrupted
