Natural Selection

Do organisms "decide" to evolve and change?

• Yes, they know they need to change to survive 
• No, they change because of natural selection

The more genetic variation a population has,

the more likely it is for some individuals to

• evolve

• migrate

• survive

• mutate

What word describes a trait that helps an organism survive in its environment?

• natural selection

• mutation

• camouflage

• adaptation

If a new trait DOES 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

Mutations are a change in what?

• DNA

• tRNA

• protein

• rRNA

Why are advantageous traits more likely to be passed onto offspring?

• Because they are more likely to survive and reproduce.
• Because they come from dominant alleles.
• Because they come from recessive alleles.
• Because the trait is an acquired phenotype.

Why do frogs and other organism reproduce so many eggs or offspring?

• so that their babies can have friends to play with
• the more offspring the more likely the offspring will survive
• the more offspring the less likely offspring will survive 
• the more offspring the less competition

The differences among a species, like different bird beaks, are called

• genes.
• variations.
• traits.
• theories.

All rabbits of the same species living in a particular area would be an example of a(n)

• population

• species

• community

• ecosystem

Why is competition important for natural selection?

• It shows which variations are more successful, allowing the organisms with those variations to survive.

• It causes organisms, regardless of which traits they have, to die out, reducing the population size.

• It causes organisms to get stronger due to having to outcompete other species.

• Competition is not important for natural selection.