4. species + taxonomy

• "3 ways in which courtship behaviour increases the probability of successful mating"

  • allows organism to recognise same species
  • formation of a pair bond
  • indicates fertility
• "Give 2 differences in the variation in body length of male and female thorny lizards"

  • females are generally longer (up to 115m)
  • females show a greater variation/ range

  
• "explain why fewer species of plant would lead to fewer species of lizard in the oil palm plantation"

  • fewer habitats
  • fewer insect species
  • so fewer food sources
• "suggest an explanation for the relationship between the concentration of herbicide and the mean crop yield"

  • as concentration of herbicide increases more weeds are killed so more crops/ higher yield
  • but high concentrations of the herbicide damage the crops

  
• complete table:

  A) Kingdom

  B) Phylum

  C) class

  D) order

  E) family

  F) luscinia

  G) svecica

  
• "what is meant by genetic diversity?"

  • number of different alleles of each gene
• "what is the difference between species richness and index of diversity?"

  • Species richness is a measure of the number of different species in a community.
  • An index of diversity describes the relationship between the number of species in a community and the number of individuals in each species.
• Explain why it may be more useful to calculate the index of diversity than to record the species richness

  • Measures number of individuals (of each species) and number of species
  • Some species only present in small numbers
• a sampling procedure could be standardised by using the same sample size of an area
• • Start at the tips (leaves) – These are the current species or taxa
  • Trace back to the nodes – Each point where branches come together is a common ancestor.
  • Follow the branches – The more recently two taxa share a node, the more closely related they are.
  • longer branches can represent evolution