B13-Variation and Evolution Natural Selection

Question 1

Variation

Answer 1

• There is always variation in a population due to mutation-lots of different alleles
• This leads to a range of different phenotype
• The differences may be very slight

Question 2

Competition

Answer 2

•Individuals within a population compete for a range of things: food, mate, shelter, water, escape from predators

Question 3

Survival of the fittest

Answer 3

•Individuals where genes give them the ‘best’ characteristics are more likely to be the best competitors.

Question 4

Reproduction

Answer 4

•Individuals who reproduce are likely to pass on these specific beneficial genes