Bio 2 Ch 24

A new species of plant evolved by allopolyploidy from two species of plant that are 2n = 6 and 2n = 12. What would the diploid number of chromosomes be in this new species?

There are two groups of pine trees that appear to be very similar phenotypically and genotypically. However, one releases pollen in January, when the female structures of that group are receptive, and one in March. What kind of reproductive barrier is this?

A hybrid zone is defined as __________.

According to the punctuated equilibrium model of evolution, __________.

The time interval between speciation events __________.

Reproductive isolation is necessary for __________ to occur.

Which of the following statements correctly describes one aspect of the punctuated model of evolution?

Which of the following is an example of a postzygotic reproductive barrier?

The morphological species concept distinguishes species by __________.

Which of the following organisms is most likely to be subject to allopatric speciation?

When gene flow between two populations ceases, the potential for __________ exists.

How many genes must change in order to form a new species?

A new species of plant is discovered that closely resembles a known species. Upon further examination, it is discovered that the new species has a tetraploid number of 4n = 12, while the known species has a diploid number of 2n = 6. Which of the following statements provides a reasonable explanation for the evolution of this new species of plant?

At which point in the adaptation of a population is it clear that speciation has occurred?

A horse and a donkey can reproduce successfully, producing a mule. However, the mule is sterile. This is an example of a __________ barrier called __________.

In which of the following groups has sympatric speciation been most important?

Prezygotic barriers __________.

Postzygotic barriers __________.

Imagine that part of a population of South American finches is blown by a storm onto an island far offshore and manages to survive and reproduce there for a period of 10,000 years. After that period, a climate change results in lower sea levels and the reconnection of the island with the mainland. Members of the formerly isolated island finch population can now interact freely with members of the original mainland population. Which of the following observations would, by itself, lead you to conclude unequivocally that the island finch population had evolved into a distinct species, according to the biological species concept?

According to the __________, a species is a group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring—but do not produce viable, fertile offspring with members of other such groups.

In the case of the Lake Victoria cichlids, sympatric speciation has been shown to be driven by __________.

The evolution of multiple species of snapping shrimp following the formation of the Isthmus of Panama is an example of __________.

Sympatric speciation typically occurs by all of the following mechanisms except __________.

Which of the following reproductive barriers actually prevents individuals of closely related species from copulating successfully?

The behavior of a male blue-footed boobie during the courtship ritual elicits no response from the masked boobie. The reproductive barrier between them is an example of __________.

Which of the following evolutionary mechanisms does not contribute to the process of allopatric speciation?

A new species of plant arises as an allopolyploid from two other plants, one with a diploid number of 14 and one with a diploid number of 18. What would the diploid number of the new species most likely be?

Two different species of frogs mate successfully and produce fertile hybrid offspring. However, the offspring of the hybrids do not develop completely to adulthood. This is an example of which type of reproductive barrier?

What is the first thing that must happen in order for speciation to occur?

Three species of sea stars all mate near the same reef by secreting their gametes into the water, but none of the gametes from the different species fertilize each other. This is an example of a __________ barrier called __________.