Unit 7 Definitions

Question 1

Niche of a species

Answer 1

The species Role in a community

Question 2

Interspecific competition

Answer 2

Competition between different species

Question 3

Intraspecific competition

Answer 3

Competition within a species (they have the exact same niche)

Question 4

Mark-release-recapture equation

Answer 4

N=(number marked in first catch x total number in second catch) / number of recaptures in second catch

Question 5

Assumptions for mark-release-recapture

Answer 5

No migration
No reproduction
Marks are not lost and don’t harm the animal or affect chance of recapture
Sample is large
All members of the population mix randomly and have an equal chance of recapture

Question 6

Allopatric speciation

Answer 6

Geographical isolation splits population into 2
This prevents interbreeding and separate gene pools form
Different random mutations occur and different selection pressures act on each population
This causes the allele frequency to change

Question 7

Sympatric speciation

Answer 7

Random mutation within population causes reproductive isolation
This prevents interbreeding and separate gene pools form
New population will pass their alleles on to their offspring and the population will rise
The two populations are two species as they cannot interbreed