Succession

Question 1

Describe what is meant by allopatric speciation

Answer 1

• geographical isolation
• separation of gene pools
• variation due to mutation
• different selection pressures
• selection for advantageous alleles
• differential reproductive success
• leads to change in allelic frequencies
• cannot breed to produce fertile offspring

Question 2

Describe what is meant by speciation.

Answer 2

• not geographical isolation
• leads to reproductive isolation
• separate gene pools
• selection for advantageous alleles
• differential reproductive success
• leads to change in allelic frequencies
• cannot breed to produce fertile offspring

Question 3

Describe how bacteria can become resistant to antibiotics.

Answer 3

• variation due to mutation
• some plants have allele to survive
• differential reproductive success
• increase in frequency of allele
• no interbreeding

Question 4

Describe the process of succession.

Answer 4

• colonisation by pioneer species
• pioneers cause change in abiotic factors
• abiotic conditions less hostile for new species
• new species make conditions less suitable for previous species
• increase in biodiversity
• stability increases
• climax community reached

Question 5

Explain how succession results in a wide variety of fish living on coral reefs.

Answer 5

• increase in variety
• provides more niches/habitats