Topic 7- Natural selection

Question 1

What is exponential growth

Answer 1

If all the offspring of every individual survived to adulthood and reproduced

Question 2

How does exponential growth occur?

Answer 2

when there are no environmental factors or population checks

Question 3

How do environmental factors limit population size?

Answer 3

they result in differential survival and reproduction

Question 4

What are biotic factors? Give some examples

Answer 4

other living organisms
predation, competition for resources and disease

Question 5

What are abiotic factors? Give some examples

Answer 5

non-living parts of an environment
light availability, water supply and soil pH

Question 6

What are environmental factors?

Answer 6

selection pressures

Question 7

Define selection pressures

Answer 7

Factors that increase the chance of individuals with a specific phenotype surviving and reproducing over others

Question 8

What happens when selection pressures act over several generations of a species?

Answer 8

can cause a change in the allele frequency and the phenotype frequency in a population

Question 9

Define genetic drift

Answer 9

when there is a gradual change in allele frequencies in a small population due to chance and not natural selection