Natural Selection and Population Evolution

Darwin referred to the process of promoting certain traits by breeding members with those traits as ____.

• natural selection

• artificial selection

• evolution

• ancestral breeding

What theory accounts for why populations can be modified over time?

• natural selection

• artificial selection

• ancestral modification

• fossil theory

Which statement is true regarding evolution?

• It describes changes over many generations

• Is is the same as natural selection.

• It only involves artificial selection

• It occurs within a single generation

What important observation did Darwin make on his voyage?

• same species on Galapagos as mainland

• Galapagos species were different than mainland species

• no life existed on the Galapagos

• populations on the Galapagos stayed the same

What are two main components of natural selection?

• vestigial structures and camouflage

• artificial selection and selective breeding

• variation and inheritance

• mimicry and artificial selection

Which of these is an example of analogous structures?

• hawk wings and fish fins

• hawk and insect wings

• horse legs and insect wings

• horse legs and elephant trunks

Drastic population decline after a major event causes an extreme genetic drift called a ____.

• nonrandom mating

• founder effect

• bottleneck

• stabilizing effect

What occurs when average traits benefit a population rather than extreme traits?

• unnatural selection

• directional selection

• disruptive selection

• stabilizing selection

Shows changes within a species

• natural selection

• selective breeding

Happens over a very long period of time

• natural selection

• selective breeding