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Biology

Eric P. Widmaier; Linda E. Graham; Robert J. Brooker

Chapter 25

Origin of Species and Macroevolution - all with Video Answers

Educators

Chapter Questions

01:22

Problem 1

Macroevolution refers to evolutionary changes that
a. occur in multicellular organisms.
b. produce new species and groups of species.
c. occur over long periods of time.
d. cause changes in allele frequencies.
e. occur in large mammals.

Christina Sorrentino
Christina Sorrentino
Numerade Educator
01:11

Problem 2

The biological species concept classifies a species based on
a. morphological characteristics.
b. reproductive isolation.
c. the niche the organism occupies in the environment.
d. genetic relation

Christina Sorrentino
Christina Sorrentino
Numerade Educator
01:15

Problem 3

Which of the following is considered an example of a postzygotic isolating mechanism?
a. incompatible genitalia
b. different mating seasons
c. incompatible gametes
d. mountain range separating two populations
e. failure of fertilized eggs to develop normally

Christina Sorrentino
Christina Sorrentino
Numerade Educator
01:26

Problem 4

Hybrid breakdown occurs when species hybrids
a. do not develop past the early embryonic stages.
b. have a reduced life span.
c. are infertile.
d. are fertile but produce offspring with reduced viability and fertility.
e. produce offspring that express the traits of only one of the original
species.

Christina Sorrentino
Christina Sorrentino
Numerade Educator
01:13

Problem 5

The evolution of one species into two or more species is called
a. gradualism.
b. punctuated equilibrium.
c. cladogenesis.
d. horizontal gene transfer.
e. microevolution.

Christina Sorrentino
Christina Sorrentino
Numerade Educator
01:16

Problem 6

The large number of honeycreeper species on the Hawaiian Islands is an example of
a. adaptive radiation.
b. genetic drift.
c. stabilizing selection
d. horizontal gene transfer.
e. microevolution.

Christina Sorrentino
Christina Sorrentino
Numerade Educator
01:11

Problem 7

A major mechanism of speciation in plants but not in animals is
a. adaptation to new environments.
b. polyploidy.
c. hybrid breakdown.
d. genetic changes that alter the organism’s niche.
e. both a and d.

Christina Sorrentino
Christina Sorrentino
Numerade Educator
01:43

Problem 8

The concept of punctuated equilibrium suggests that
a. the rate of evolution is constant, with short time periods of no
evolutionary change.
b. evolution occurs gradually over time.
c. small genetic changes accumulate over time to allow for phenotypic
change and speciation.
d. long periods of little evolutionary change are interrupted by short
periods of major evolutionary change.
e. both b and c.

Christina Sorrentino
Christina Sorrentino
Numerade Educator
01:15

Problem 9

Researchers suggest that an increase in the number of Hox genes
a. leads to reproductive isolation in all cases.
b. could explain the evolution of color vision.
c. allows for the evolution of more complex body patterns
in animals.
d. results in the decrease in the number of body segments
in insects.
e. does all of the above.

Christina Sorrentino
Christina Sorrentino
Numerade Educator
01:15

Problem 10

The observation that the mammalian Pax6 gene and the Drosophila eyeless gene are homologous genes that promote the formation of different types of eyes suggests that
a. Drosophila eyes are more complex.
b. mammalian eyes are more complex.
c. eyes arose once during evolution.
d. eyes arose at least twice during evolution.
e. eye development is a simple process.

Christina Sorrentino
Christina Sorrentino
Numerade Educator