Variation and evolution.

Question 1

What is variation?

Answer 1

The differences in phenotypes within a species.

Question 2

Heritable variation meaning.

Answer 2

Can be passed on to offspring
Genetic differences caused by crossing over, independent assortment,sexual reproduction, epigenetic differences.

Question 3

Non-heritable meaning.

Answer 3

Cannot be passed onto offspring
Differences caused by the environment.

Question 4

Continuous variation meaning.

Answer 4

Many intermediates/take lots of possible values
Polygenic (controlled by many genes)
Phenotype influenced by the environment
Forms a normal distribution curve.

Question 5

Discontinuous variation meaning.

Answer 5

Characteristics have no intermediates
Monogenic (controlled by 1 gene)
Gene expression not influenced by the environment
Drawn as a bar chart.

Question 6

Intraspecific competition meaning.

Answer 6

Between members of the same species.

Question 7

Interspecific competition meaning.

Answer 7

Between members of a different species.