Summary
Summary Topic 5 Speciation
Edexcel Biology Topic 5 Speciation, Evolution, Natural Selection, Reproductive Isolation.
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SpeciationSpeciation emergence of a new species within a
population due to reproductive isolution
S.I units -
cannot reproduce to create
fertile offspring
driven
by natural Selection
Allopatric -
geographical reproductive isolation
-type of prezygotic reproductive isolation
Breakaway population :
founder population -
small gene pool
↳
different environments ,
different selection pressures
different different
alleles
advantageous , phenotype
no
gene flow genetic drift
:
↳ no
sharing of alleles
mutations = new alleles
changes allele
in
frequency
Sympatric -
same
geographical location
Prezygotic Sperm can't
get to te
egg
-
-
behavioural courtship behaviour , reproductive
behaviours
-
mechanical + certain
genitalia are incompatible
different of he
Temporal times
active at
day
>
-
or
year
-
habitat
Ecological preference of
-
area
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