17. Hybridization is not the same thing as introgression, because: a. reinforcem

Question

17. Hybridization is not the same thing as introgression, because:

a. reinforcement will tend to reduce the incidence of introgression, but it has no effect on the prevalence of hybridization

b. if two organisms hybridize, they must be considered to be the same biological species, so by definition, introgression cannot be taking place

c. Dobzhansky-Muller incompatibilities can act to prevent hybridization but not introgression

d. a geographic barrier is necessary in order to prevent hybridization from taking place

e. if post-zygotic reproductive isolation is high, then hybridization will not result in movement of genes across the species boundary

18. In the phylogeny of marine shrimp in the genus Alpheus in the figure above, the P species are from the Pacific side and the C species are from the Caribbean side of the Isthmus of Panama. Which of the following is the most likely cause of speciation?

a. Sympatric speciation

b. Parapatric speciation

c. Allopatric speciation via dispersal across the Isthmus of Panama

d. Allopatric speciation via isolation when the Isthmus of Panama closed

19. A phylogenetic event horizon is

a. a point in the future in which species will diversify.

b. a phylogeny based on extinct species.

c. the point at which life started.

d. a point in the history of life beyond which phylogenetic analysis cannot see.

20. The Miller–Urey experiment is significant because it produced evidence that

a. conditions on Earth 4 billion years ago could produce RNA.

b. it is possible to produce LUCA in the laboratory.

c. conditions on Earth 4 billion years ago could in principle produce amino acids.

d. it is possible to produce DNA under the same conditions as on Earth 4 billion years ago.

21. Two bird species exhibit postzygotic isolation in that half of the hybrids formed between them are sterile. If Haldane’s rule applies here, then the individuals that are sterile are likely to be

a. female.

b. young.

c. male.

d. old.

Explanation / Answer

17). e. if post-zygotic reproductive isolation is high, then hybridization will not result in movement of genes across the species boundary.

If post-zygotic reproductive isolation is high, the movement of genes across the species boundary does not occur because the resulting offpsring may die prematurely or become infertile.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.