Exam 23: Species and Their Formation

Suppose one incipient species of beetle prefers to live and mate in grassy areas and its sibling incipient species prefers sandy soils. This would be an example of _______ isolation.

Females of the beetle species Tribolium castaneum can readily mate with T. freemani. If these females mate with males of both their own species and males of T. freemani, nearly all of their offspring are pure species T. castaneum with very few hybrids. This occurs because the sperm of T. castaneum blocks the sperm of T. freemani within the reproductive tract of the T. castaneum female. This is an example of _______ isolation, a form of _______ isolation.

Adaptive radiation of plants

When reproductive isolation between developing species evolves with the populations being geographically separated, the mode of speciation is called geographic or _______ speciation.

Which of the following statements about the Dobzhansky-Muller model of speciation is false?

Which of the following statements about the hybrid zone in the European Bombina toads is false?

What is the main reason that there are so many species of land snails in the Hawaiian Islands?

What did the experiments by Rice and Salt with fruit flies show?

The original host fruit of Rhagoletis pomonella was the _______.

Which of the following statements about speciation is false?

In autopolyploidy, a new species of plant can arise by the doubling of chromosome numbers in a single individual of one species (provided that the individual is capable of self-fertilization). Why is it virtually impossible for such a tetraploid plant to interbreed successfully with diploid individuals of the "same" species?

Species of lacewings apparently evolved reproductive isolation without geographical isolation. This is an example of _______ speciation.

Which of the following is not a prezygotic reproductive isolating barrier?

Suppose that the natural ranges of horses and donkeys were to overlap. Which of the following statements best describes what would likely happen to the populations over time?

In terms of their reproductive capacity, mules, which are hybrids between horses and donkeys, are a classic case of hybrid _______.

The hybrids between tetraploid and diploid plants of the same ancestral species

An evolutionary biologist makes decisions about whether to consider different populations of lacewings as separate species based on observations of the individuals with which these lacewings will mate. This biologist is most likely employing the _______ species concept.

Which of the following statements about the Dobzhansky-Muller model of speciation is true?

Which of the following situations is least likely to lead to geographic isolation, hence inhibiting allopatric speciation?

According to the Dobzhansky-Muller model, the evolution of reproductive isolation requires changes at (at least) _______ genetic loci.