1. All of the following are examples of postzygotic reproductive isolating mecha

Question

1. All of the following are examples of postzygotic reproductive isolating mechanisms EXCEPT

Select one:

a. the hybrid offspring of two species being sterile.

b. a sheep adapted to mountains mating with a sheep adapted to desert producing offspring maladapted to either habitat.

c. the hybrid offspring of two species being fertile but their offspring being inviable or sterile.

d. the hybrid offspring of two species dying before birth.

e. two plant species flowering at different times.

2.Horizontal gene transfer is most common

Select one:

a. among viruses.

b. among eukaryotes.

c. among bacteria.

d. from plants to animals.

e. from eukaryotes to bacteria.

3.A(n) _____________ tree is one that contains an internal node representing the common ancestor to all other nodes in the tree.

Select one:

a. phylogenetic

b. most parsimonious

c. gene

d. outgroup

e. rooted

4. Before the advent of molecular techniques, researchers indirectly assessed genetic variation in populations through the study of ____________ diversity.

Select one:

a. phenotypic

b. fossil

c. anagenic

d. mutational

e. protein

Explanation / Answer

1. e. two plant species flowering at different times. (It is an example of temporal isolating mechanism).

2. c. among bacteria.

3. e. rooted

4. a. phenotypic

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