Module 4 - Classification Flashcards
Explain how biological molecules can provide evidence that species have evolved.
We can look at the DNA of two species , if there is a similarity in the sequence than we can deduce that there is an evolutionary relationship.
We can look at proteins and if the amino acid chain is similar then there is a evolutionary relationship
What are levels of the taxonomic group after kingdom
Phylum
Class
Order
family
Carl Woese suggested a new top level taxon - domain
He used his results from studying RNA
Name the cell component that appears in organisms of all 3 domains that Woese suggested
Ribosomes
One of the domains is called Eukarya
Name the other 2 domains
Bacteria
Archaea
State 2 defining features of all membranes of the domain Eukarya
Nucleus
Linear DNA
80s ribosomes
State 3 reasons why the three domain classification system is now used in preference to the five kingdom system
The 3 domains fit phylogeny better
There are differences between bacteria and archaea such as having different cell membranes
Eukaryotes all have a nucleus
Woese carried out a detailed study of RNA molecules in order to draw his conclusions.
Suggest two ways in which the scientific community are likely to have validated Woese’s research
Peer Review
Replication of work by others to see if same results are obtained
The Titicaca water frog, Telmatobius culeus, is an aquatic amphibian found in Lake Titicaca in South America.
Name the genus of the Titicaca water frog
Telmatobius
Suggest why it is only in the last 10 years that the Iberian lynx has been classified as a separate species
Better technology has evolved
More genetic evidence
In the past roe deer’s main natural predator in Britain was a large carnivore of the cat family. The lynx became extinct in Britain around 1000 years ago. Plans are being considered to reintroduce the Eurasian lynx from these European populations to the wild parts of Britain to improve biodiversity.
Suggest one reason why some people might object to this reintroduction.
Could cause potential danger to local wildlife and the environment may no longer be suitable for lynx
The Iberian Lynx and Eurasian lynx were once classified within the species, based on their observable features.
In the past 10 years, the Iberian lynx has been reclassified as a separate species within the genus Lynx, on the basis of its phylogeny
Define the term phylogeny and explain how phylogeny is related to classification. Use the lynx species as examples.
Phylogeny is the evolutionary relationship between species.
Phylogeny is the basis of classification, species within the same group have common ancestor
The lynx are similar as they have been placed in the same genus.
A multicellular organism with a cell wall is what kingdom and what would the cell wall be made out of
Plant kingdom
Cellulose
A unicellular organism with a cell wall is what kingdom and what would the cell wall be made out of
Fungi
Chitin
Describe how the genetic material is arranged in organisms in the same kingdom as a unicellular organism
Only one chromosome
Discuss the classification of slime moulds and include the range of evidence which classification might be based on
Slime moulds are eukaryotes. This is based on the amino acid sequences. Amino acid sequence of slime moulds are more similar to plants and fungi than protoctists.
