Summary Topic 5 Speciation

Speciation
Speciation 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