• Home
  • Textbooks
  • Biology
  • Speciation and Macroevolution

Biology

Eldra P. Solomon, Charles E. Martin, Diana W. Martin,

Chapter 20

Speciation and Macroevolution - all with Video Answers

Educators

Chapter Questions

00:15

Problem 1

A prezygotic barrier prevents (a) the union of egg and sperm (b) reproductive success by an interspecific hybrid (c) the devel. opment of the zygote into an embryo (d) allopolyploidy from occurring (e) changes in allometric growth

Morgan Thompson
Morgan Thompson
Numerade Educator
00:13

Problem 2

The reproductive isolating mechanism in which two closely related species live in the same geographic area but reproduce at different times is (a) temporal isolation (b) behavioral isolation (c) mechanical isolation (d) gametic isolation (e) hybrid inviability

Morgan Thompson
Morgan Thompson
Numerade Educator
00:20

Problem 3

Interspecific hybrids, if they survive, are (a) always sterile (b) always fertile (c) usually sterile (d) usually fertile (e) never sterile

Morgan Thompson
Morgan Thompson
Numerade Educator
00:26

Problem 4

The first step leading to allopatric speciation is (a) hybrid inviability (b) hybrid breakdown (c) adaptive radiation (d) geographic isolation (e) paedomorphosis

Morgan Thompson
Morgan Thompson
Numerade Educator
00:28

Problem 5

The pupfishes in the Death Valley region are an example of which evolutionary process? (a) background extinction (b) allopatric speciation (c) sympatric speciation (d) allopolyploidy (e) paedomorphosis

Morgan Thompson
Morgan Thompson
Numerade Educator
00:31

Problem 6

Which of the following evolutionary processes is associated with allopolyploidy? (a) gradualism (b) allometric growth (c) sympatric speciation (d) mass extinction (e) preadaptation

Morgan Thompson
Morgan Thompson
Numerade Educator
00:24

Problem 7

According to the punctuated equilibrium model, (a) populations slowly diverge from one another (b) the evolution of species occurs in spurts interspersed with long periods of stasis (c) evolutionary novelties originate from preadaptations (d) reproduc. tive isolating mechanisms restrict gene flow between species
(e) the fossil record, being incomplete, does not accurately reflect evolution as it actually occurred

Morgan Thompson
Morgan Thompson
Numerade Educator
00:30

Problem 8

The evolutionary conversion of reptilian scales into feathers is an example of (a) allometric growth (b) paedomorphosis (c) gradualism (d) hybrid breakdown (e) a preadaptation

Morgan Thompson
Morgan Thompson
Numerade Educator
00:38

Problem 9

Adaptive radiation is common following a period of mass extinction, probably because (a) the survivors of a mass extinction are remarkably well adapted to their environment (b) the unchang. ing environment following a mass extinction drives the evolutionary process (c) many adaptive zones are empty (d) many ecological niches are filled (e) the environment induces changes in the timing of development for many species

Morgan Thompson
Morgan Thompson
Numerade Educator
00:21

Problem 10

The Hawaiian silverswords are an excellent example of which evolutionary process? (a) allometry (b) preadaptation (c) microevolution (d) adaptive radiation (e) extinction

Morgan Thompson
Morgan Thompson
Numerade Educator
03:31

Problem 11

Use two different colors to depict the unduplicated chromosomes of species $C$ with larger chromosomes $(2 n=8)$ and species $D$ with slightly smaller chromosomes $(2 n=10)$, and of their $F_{1}$ hybrid. Is the hybrid likely to be fertile?

Josee Pacheco
Josee Pacheco
Numerade Educator
00:29

Problem 12

Is allopatric speciation more likely to occur if the original isolated population is small or large? Explain your
answer.

Morgan Thompson
Morgan Thompson
Numerade Educator
00:48

Problem 13

Could hawthorn and apple maggot flies be considered an example of assortative mating, which was discussed in Chapter 19 ? Explain your answer.

Morgan Thompson
Morgan Thompson
Numerade Educator
00:42

Problem 14

Because mass extinction is a natural process that may facilitate evolution during the period of thousands to millions of years that follow it, should humans be concerned about the current mass extinction we are causing? Why or why not?

Morgan Thompson
Morgan Thompson
Numerade Educator
00:38

Problem 15

Examine Figure $20 \cdot 2 c$ and predict which date is likeliest for researchers to have collected wood frogs and leopard frogs and interbred them in the lab: March $10,$ April 1 , or April $15 .$ Explain your answer.

Josee Pacheco
Josee Pacheco
Numerade Educator