Module 7- Populations

Question 1

3 marks

What does the Hardy- Weinberg principle predict?

Answer 1

1. The frequency of alleles (of a particular gene)
2. Will stay constant over generations
3. Providing no mutation/ no selection/ mating at random/ large population/ no migration

Question 2

2 marks

The scientists concluded that the observed frequencies of the four phenotypes differed significantly from the expected frequencies. Use your knowledge of the Hardy–Weinberg principle to suggest two reasons why

Answer 2

1. Selection against/for a phenotype
2. High rate of mutation
3. Immigration/emigration
4. No random mating

Question 3

2 marks

Define population

Answer 3

1. A group of organisms of the same species in a particular space at a particular time
2. That can interbreed

Question 4

Define intraspecific competition

Answer 4

Intraspecific competition describes competition for the same resources between the same species

Question 5

Define interspecific competition

Answer 5

Interspecific competition describes competition for the same resources between different species.

Question 6

What happens in a predator prey cycle

Answer 6

1. Prey numbers increases when resources available [low intraspecific competition]
2. Predator numbers increase as prey availability increases
3. Predator numbers peak after the prey [lag]
4. Increased predation decreases prey numbers
5. Predator numbers decrease due to starvation as prey get eaten [high intraspecific competition]