Taxonomy; the
identification
and naming of
organisms
classification;
putting items
into groups
hierarchy; any
group within a
system of
classification
D>K>F>C>O>F>G>S
members of the same species can interbreed to produce fertile offspring
Taxa are discrete, at any level of classification, an organism
belongs in one taxon and in no other
the 3 domains-
similarities in DNA base
sequence
Eubacteria;familiar
bacteria, they are
prokaryotes
Archea; unusual
metabolism, are
prokaryotes
Eukaryota;
plantae, animilia
, fungi and
protocista
5 kingdom system- basis on their physical appearances
3 domain
Eubacteria
prokaryota Ribosomes 70s
microscopic, contains all the bacteria
and cyanobacteria(blue-green algae)
saprotrophic- feeds on
dead/decaying matter by
extracellular digestion
and absorption. parasitic
or autotrophic
cell wall- peptidoglycan
archaea
Eukaryota
Protoctista, fungi, plantae, animalia Ribosomes 70s
protoctista
some single celled, some plant like
some animal like and some both like
cells
autotrophic/heterotrophic
cell wall- cellulose or none
plantae
reproduce with
spores or seeds
(plants)
autotrophic
cell wall- cellulose
fungi
yeast are single celled.
Moulds have hypae that
weave together to form the
body of the fungus, a
mycelium. In some, cross cell
walls, called septa sub divide
the hypae
saprothrophic or parasitic
cell wall- chitin
animilia ;
animals
heterotrophic
cell wall- non
5
Kingdoms
homologous structures; have a
similar arrangement of
component parts and a similar
developmental origin but
different functions
divergent evolution; a common ancestral structure
has evolved and performs different functions e.g
pentadactyl; have five digits
convergent evolution; structures
evolve similiar properties but have
different developmental origins,
such structures are analogous
analogous structures; have a
corresponding function and similar
shape, but have a different
development origin
Assessing relatedness with genetic evience
DNA sequences
confirm evolutionary
relationships and correct
mistakes made in
classification based on
physical characteristics
DNA hybridisation
comparing the DNA base sequences of
2 species. DNA separated from both
and cut into fragments which are then
mixed and where they have
complemantry base sequences they
hybridise together
amino acid sequences
the sequence is determined by DNA base
sequence, similarity in sequence shows
how closely related the species are
immunology
proteins of different species can be
compared, if you mix the antigens of one
species such as the blood protein albumin,
with specific antibodies of another, the
antigens and antibodies make a precipitate.
the closer the evolutionary relationship, the
more the antigen and antibody react to make
a ppt
Taxonomy; identification and naming of organisms
biodiversity; the number of species and the number of individuals in each species in a specified region
high energy input by sun so at equator means high energy input in ecosystems so greater bidiversity
biodiversity index; Simpsons index
higher the value, higher the biodiversity
a genes position on a chromosomes is its locus. a locus shows
polymorphism; the occurrence of more than one phenotype in a population
that cannot be accounted for by mutation alone
genetic/DNA fingerprinting/profile; terms of a pattern
unique for each individual, related to the base
sequences of their DNA
non coding sequence sequences in DNA undergo mutation. when 1 base that differs its called SNPs
(snips) single nucleotide polymorphism. Unique longer base sequences of non coding DNA is called
hyper variable regions(HVR) or short tandem repeats (STR)
Natural selection; the gradual process in which inherited
characteristics become more or less common in a population in
response of the environment determining the breeding success of
individuals processing those characteristics