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Summary Alevel OCR Biology A notes on Classification and Evolution

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Alevel OCR Biology A notes on Classification and Evolution from an A* biology student.

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Classification +
Evolution
-




arrange species into groups based evolutionary origins relationships
+

on


-



No overlap between groups (taxas
biromial name
-
taxonomic ran=lingdom, phylum, class, favilly,
-




order, genus, species

domains=elharya,
-




bacteria, archaea, branded hydrocarbon chains
membrace lipick= banded glycerol by
to
procycles ether linkages

-
170s ribs cres


-Archaea extremophile =


procycles, no nucleus, lique lipids, no
peptidoglycan all
in walls, 70s riboares



Bacteria prohcryctic cells,
-



no rucleus, divide by binary fission, membrace lipids=ibranded hydrocarbon chairs banded to glycral
=




by ester linkages.

Euharya eukaryotic alls, rolli, membrane band organelles, divide by mitosis, reproduce sexually/asexually
-
=




-kingdoms =
Proncycha, Protoctista, Sngi, Plantae, Armala



Prohcycta bactria+ blue-green bacteria, micellar,
=

all walk, cytoplasms, no
waleu/mitochondria, dide by binary fission.


Proboctista euhaytic, =

single aled/group of similar cells, protozoa:t o all
wall/ algae:cellulose all wa l t
chloroplate


Fungi=enhayetic, non-cellulose can walls with, no cilia, heterotrophs, reproduce via sports, vicelular, hyphae=
mycelium, spares


Plantae mulicellular, enhaydic,
=

allulose all walls, large permanent vacuoles, chloroplash, save to flagella, autotrophs

Animalia muticellular, eulcydic,
=


small temporary vacules, no cell walk, save tu cilia, hereworrophs, reware system -
chemicals.


-Phylogeny eudutionary history of organism
=





DNA, RNA +
protein sequencing determine order of
-

bases
DNA/MRNA amim
+


creide, compare extinct/similar species
↳more similar sequences: more closely related/separated into die species
more recently


for ↑time to
accumulate mutations changes to MRMA
species separated longer DLA, arrimo area
= +
+




-DNA
analysis DNA extracted
=


from all nuclei, processed, analysed
+
base sequence obtained compared
+



organioms:determine
to




evolutionary relataslips

,
fossil evidence
Immunology
-


-
organism proting compared
-molecular evidence


Evolution theory of
-



=
evolution natural
+
selection



"Dan=more offspring produced than could swine, population locate but not significantly, population of same species
=




introspectic variation, inherit parental characteristics

-




Genetic variation variation
=


genotypes
in between / within a species


features
-




Pherotypic variation
variation: in




Interspecific Intrappectc- with in
-




between
-

species, species

genetic factors -
Discontinuous variation = distinct forms w/ no immediate types, qualitative offerences:d iscrete +
distinguishable

categories
-
Bar Graph

continuous quantitative differences prepolypes of indudrals a population for particular characteristics,
teniron---
variation: in
genes in


range of values between a extremes -

Histograph

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