Variation and Evolution

Question 1

What is variation?

Answer 1

Differences between individuals.

Question 2

What are the 2 types of variation:

Answer 2

Genetic variation.
Environmental variation.

Question 3

What are the 5 factors of environmental variation:

Answer 3

Climate
Diet
Accidents
Culture
Lifestyle.

Question 4

What is natural selection?

Organisms that are better adapted to an environment will ____________ and have more _____________.

This means their _______________________ to the __________________.

Answer 4

survive
offspring

genes are passed on
future generations

Question 5

During the industrial revolution, pollution killed off some lichens and soot deposits caused the bark on trees to appear darker.

Light coloured moths were _________________________ and were __________________.

As a result, dark moths had a ___________________________ and ___________________________, through this the _________ that made them _________.

This led to a gradual increase in the ____________________ until light moths became very rare in industrial areas.

Answer 5

no longer camouflaged
eaten by birds

greater chance of reproducing
passing on the phenotype
alleles
dark

proportion of dark moths

Question 6

If two populations of one species become increasingly different in _____________ that they can no longer ____________ to form ________________.

This can result in the formation of ________________.

Answer 6

phenotype
interbreed
fertile offspring

two species