Natural Selection

What is natural selection?

• process in which helpful traits become more common over time

• a trait that helps an organism survive better

What process is being shown in this image?

• Variation
• Natural Selection
• Selective Breeding
• Homeostasis

Why is the mouse population changing over time?

• The hawks eat more light mice than dark mice because they can see the light mice more easily

• The hawks eat more dark mice than light mice because they can see the dark mice more easily

What happens to new traits that HELP organisms survive over time?

• They become MORE COMMON

• They become LESS COMMON

• They are EQUALLY COMMON

If a new trait DOES NOT help an organism survive, what may happen to it?

• It dies and its DNA is not passed on

• It survives and its DNA is passed on

• It changes its traits to adapt and survive

"Survival of the fittest" describes which theory

• Natural selection

• Selective breeding

Match the following Vocabulary Words

• Variation

• More organisms are born than can survive

• natural selection

• The struggle between organisms for the same limited resources in a particular area

• overproduction

• Organisms that are best adapted to a specific environment survive and produce more offspring that organisms that are not as well adapted

• Competition

• Any differences in traits between members of a species

This picture is an example of :

• Natural Selection

• Protein Synthesis

• Gene Expression

• Mutations

True or False:

1. Natural selection favors certain traits that increase an organism's chances of survival and reproduction. - ​ (a)  

2. Natural Selection always favors the strongest animal. - ​ (b)  

3. Natural Selection over time can lead to changes in organisms. - ​ (c)  

• True
• False

What are the three aspects of Natural Selection?

(Click Three Answers)

• Variations, Competition , Overproduction

• Competition, Homeostasis , Overproduction

• Overproduction, Participation, Variations

• Variations, Gene Expression, Competition