Natural Selection

Prokaryotic lack which of the following?

• Nucleus

• Ribosome

• Cell Membrane

What are the variations in the frogs?

• passing down their DNA to other frogs

• the skin color - brown and green

• being able to breed with each other

Fitness is determined by

• how many offspring they have

• how strong they are

Mutations....

• decrease genetic varation

• increase genetic variation

Mutaitons and variations are...

• willed into existence

• random

Variations can be 

• Only Neutral

• Only Negative

• Negative, Positive, or Neutral

• Only Positive

A trait that is an advantage is called a(n)

• Trait

• Fitness

• Adaptation

Bacteria are all the same and do not have variations within the species.

• True

• False

What makes bacteria dangerous when they undergo NATURAL SELECTION?

• They can resist antibiotics and copy their genes to other bacteria to make people very sick

• They are everywhere and in everyone and do not change over time so that we can defeat them with antibiotics

• They are in hospitals and cannot be killed without a hazmat suit on

The bacteria in the example evolved because of...

• natural selection

• genetic drift

• gene flow