00:01
So let us first see what is prezygotic and postzygotic type of isolations.
00:07
Now when we speak about prezygotic in particular, this could be defined as the isolation, which is a mechanism that prevents the fertilization of eggs.
00:20
We'll write fertilization as f so it prevents the fertilization of eggs, hence put as x mark.
00:27
Whereas post -zygotic type of isolation is the isolation which is a mechanism preventing the formation of fertile offspring.
00:41
So here fertile offspring is been prevented from forming in post -sigotic type of isolation in particular.
00:52
Now secondly, we see that in pre -zygotic.
00:57
Category, the isolation fertilization does not take place whereas in post -diotic there is fertilization which particularly occurs.
01:06
Now categories that come under pre -zzygotic are habitat isolation written as h behavioral isolation written as b and mating isolation, mating season particularly written as ms and temporal isolation written as t and also gamet isolation written as g.
01:27
And in post -diogotic we have hybrid inevitability written as h -y, hybrid breakdown written as hb and hybrid sterility written as h -s.
01:39
So these are the forms and here what we see is mating does take place.
01:46
In pre -zigoting mating does not take place...
