Factors Affecting Genetic Variation-Standard Bio 4.3

Question 1

What factors affect natural selection? Select three options.

Revolt · Accepted Answer

variation; overpopulation; adaptation

Question 2

Evolution of a species acts on the of the species, not the .

Revolt · Accepted Answer

individuals; population

Question 3

In London, peppered moths that were light colored blended in with trees of the area, and were well populated. Over time, pollution caused the bark of the trees to darken, causing a decrease in the number of light colored moths seen. The darker colored moths survived the predators since they were able to blend in with the darkened tree bark, and they reproduced rapidly.

Revolt · Accepted Answer

directional selection

Question 4

Using the drop-down menus, identify the mode of selection explained below. The finches of the Galapagos Islands changed over time as insects became more plentiful. Finches with smaller and longer beaks were favored.

Revolt · Accepted Answer

disruptive selection

Question 5

Babies who are born in the mid-range for weight have a greater chance of surviving birth than do babies who are too small or too large.

Revolt · Accepted Answer

stabilizing selection

Question 6

Which of the following explains biodiversity?

Revolt · Accepted Answer

the total variety of organisms on Earth

Question 7

What are the two phases of speciation?

Revolt · Accepted Answer

change of existing species; splitting of existing species into two or more different species

Question 8

Natural selection leads to .

Revolt · Accepted Answer

evolution

Question 9

is the formation of a new species from an existing species and can occur in two phases.

Revolt · Accepted Answer

Speciation is the formation of a new species from an existing species and can occur in two phases.

Factors Affecting Genetic Variation-Standard Bio 4.3 Answers

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