Introduction to Natural Selection
Natural Selection
Natural Selection 2
100

True or False: Natural selection acts on genotypes

False, it acts on Phenotypes

100

True or false: a trait that is “selected for” is a trait that is good and/or helpful to the individual.

False, traits can also be harmful or not beneficial 

100

Natural selection is a theory that states the environments will force selection of the best:

a. physical skills

b. heritable traits

c. location

d. predato

b. heritable traits
200

Who Was Charles Darwin?

An English naturalist/scientist/father of evolution

200

Define natural selection

A process in which individuals that have certain traits tend to survive and reproduce at higher rates than other individuals because of those traits.

200

Which of the following would most likely

not lead to natural selection?

a. birds with longer beaks get the more

food

b. longer whales mate more

successfully

c. a monkey finds an easy source of

food

d. darker tigers are selected as mates

more often

c. a monkey finds an easy source of

food

300

What idea(s) did Charles Darwin propose?

Descent with modification and Natural Selection

300

Some organisms, like the kangaroo rat, live in very hot environments. These mice are only active at night when it’s cool and have highly efficient kidneys to absorb as much water from their food sources as possible. These traits are known as __________

Adaptations

300

In a population of sea turtles all of the following could be examples of natural selection except

a. large females lay more eggs than small

females.

b. large males have more wounds from

fights than small males.

c. large males mate with more females than

small males.

d. small females are more likely to be killed

by sharks than large females.

b. large males have more wounds from

fights than small males.

400

Define evolution

Evolution is the change in the genetic makeup of a population over time

400

Contrast between artificial and natural selection

Artificial selection is human selection for traits vs nature in natural selection

500

A fire burns down part of a forest region in South America. Due to the fire, a native species of lizard loses much of its food source. The lizard subsequently loses weight. The food scarcity is present for several years and subsequent generations of lizards are much thinner than in previous years. Is this an example of natural selection? Explain your answer.

No because no trait was being selected for. The lizard loss weight due to a food scarcity, there was no change to its phenotypes for natural selection to select for.


500

What does “fitness” refer (in terms of natural selection)?


An organisms ability to survive and reproduce

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