Variation And Selection

Question 1

What are the two factors that effect variation?

Answer 1

Genetics and Environment

Question 2

Define variation.

Answer 2

Range of traits/characteristics in the same species.

Question 3

Define evolution.

Answer 3

A continuous process in which there is a gradual change in a species over time in responses to changes in the environment.

Question 4

Define extinct.

Answer 4

No living samples of the species are left e.g. Dodo

Question 5

Define endangered.

Answer 5

Population of a species is so low it is at risk of extinction e.g. corncrake birds.

Question 6

What are the factors of continuous variation?

Answer 6

Range of values
Caused by genetics and environmental factors
Height and weight are examples
A histogram shows continuous variation

Question 7

What are the factors of discontinuous variation?

Answer 7

Set values
Caused by genetics only
Blood group and tongue rolling are examples
A bar chart ( which has spaces ) shows discontinuous variation.

Question 8

What happens in natural selection?

Answer 8

Variation in the population
Struggle for existence for a resource
Better adapted to survive
Struggle for existence
Those with XXXXX gene survive ( survival of the fittest )
Reproduce
Pass on the XXXXX gene to offspring, increasing population.