5.4.1 - Evolution By Natural Selection

Question 1

What Is Meant By ‘Evolution’?

Answer 1

When the frequency of an allele, in a population changes overtime.

Question 2

What May Cause Alleles To Change?

Answer 2

Random mutation, causing them to be more or less advantageous.

Question 3

What Is Natural Selection?

Answer 3

When organisms are better adapted to their environment, continue life processes, passing on their advantageous alleles, causing these alleles to increase in frequency within a population.

Question 4

What Needs To Be Present For Natural Selection To Occur?

Answer 4

Variations existing between individuals in a population.

Question 5

What Is A Source Of Variation?

Answer 5

Mutations.

Question 6

Describe The Process Of Natural Selection
(5 Points)

Answer 6

~ Variations in alleles are present in the population, due to random gene mutations.

~ Meaning some individuals are better adapted to the environment, against predation and competition for natural resources.

~ These individuals are more likely to survive and reproduce to pass on their advantageous allele.

~ This advantageous allele, will increase in frequency within the population.

~ This allele will become most common, as the unfavourable allele decreases in frequency.