These are A* quality notes that I wrote during my A Levels to help me revise for A Level Edexcel A SNAB Biology. Notes and resources for this exam board are very limited so I hope these notes help students that are struggling to find resources online. I wrote these using my class notes, the Edexcel...
as -
These are A* quality notes that I wrote during my A Levels to help me revise
for A Level Edexcel A SNAB Biology. Notes and resources for this exam
board are very limited so I hope these notes help students that are
struggling to find resources online. I wrote these using my class notes, the
Edexcel SNAB textbook, mark schemes and other online resources such as
savemyexams. At the end of the document, I have written some common
exam questions that I came across during my revision along with their mark
scheme points so you can see which points are important to revise. Once
you have read through topics, I’d highly recommend doing exam questions
and trying to finish the specification as soon as possible so you can do as
much exam prep as possible. I hope these notes are useful for you as they
were for me and I wish you luck in your studies!
https://notesbyprabs.etsy.com
, interbreed
species group of organisms that can to
produce
· -
fertile offspring ,
and which are reproductively
isolated from other species
· DNA analysis
↳
Helps us to tell whether different populations are one species
or two
·
Habitat -
place where an organism lives
·
Population -
group of interbreeding individuals of the same
species found in I area .
·
community -
various populations in a habitat
·
Biodiversity -
variety of species that belong b every different
group of organisms
·
Endemism-species that is found in
only 1
regicn or location
·
species richness -
number of species present in a habitat
-
↑ species
=
↑ species richness
-can be used to measure biodiversity in a
habitat
Species Richness vs Genetic Diversity .
[2]
↳SR =
no .
of species in habitat
↳ GD No alleles 1 species
of in
=
.
, Heterozygosity Index (H) =
number of heterozygotes
number
of individuals in population
·
Biodiversity can be compared in different habitats by
calculating an Index of Diversity (n) :
↓
D
=
· N-> total number of organisms of All species
·
n -> total number of organisms of EACH species
· Niche -
the way an organism exploits its environment
Adaptations
⑯ -
Behavioural ↓ Anatomical C
Physiological" structures seen during
:
actions taken by
~Features
I
organisms to help Of observation or dissection
I
them to survive the internal of an organism
or reproduce workings of
organisms that
help survival
a reproduction
I
I
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