Darwin's Theory

Question 1

Which would least likely be a cause of natural selection?

Revolt · Accepted Answer

evolution

Question 2

In the African savanna, more wildebeests are born than the environment can support. Which is most likely to happen over a period of years as a result?

Revolt · Accepted Answer

Individuals that are well suited to the environment reproduce, and those that are not well suited die before they reproduce.

Question 3

Scientific investigations often lead to the formulation of new scientific questions. Charles Darwin reviewed his observations after he returned home from his voyage studying the selective breeding of pigeons. Which question would he be prompted to ask based on his voyage?

Revolt · Accepted Answer

Can selection in nature also lead to a new species over time?

Question 4

Koalas are marsupials that are found in eastern Australia. Although their ancestors lived mostly on the ground, modern koalas spend most of their time in eucalyptus trees. This is possible because their hands and feet have strong claws and opposable digits.What other adaptation could have helped koalas as they evolved from land dwellers to tree dwellers?

Revolt · Accepted Answer

fur color that closely matches the eucalyptus bark color

Question 5

What is natural selection?

Revolt · Accepted Answer

a process that selects variations that help with survival and that spreads the variations to more offspring

Question 6

Charles Darwin observed a unique beak size and shape in the finch population of each of the Galapagos Islands that he visited. Which is the most likely cause of the observed variation?

Revolt · Accepted Answer

competition among individuals for available food sources

Question 7

The map shows the allele frequency of sickled hemoglobin (HbS) and malaria endemicity in Africa. Which statement best explains the relationship between HbS allele frequency and malaria endemicity in Africa?

Revolt · Accepted Answer

When an area is malaria free, the HbS allele frequency is between 0 and 4.04.

Question 8

Which statement would least likely be used to describe variation?

Revolt · Accepted Answer

Variations that decrease reproductive success are more likely to be passed on.

Question 9

During a trip to the Galapagos Islands, which observation led Charles Darwin to suspect that organisms change over time?

Revolt · Accepted Answer

Island finches resembled mainland finches, but were not the same species.

Question 10

Which organism exhibits behavioral adaptation?

Revolt · Accepted Answer

a possum playing dead to increase its chances of survival

Darwin's Theory Answers

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