00:01
Okay, we're talking about pre -zygotic isolation.
00:03
What can we say about them? do they reduce the fitness of the hybrid offspring? do they prevent individuals of different species from producing zygotes? are they only found in animals, only found in plants, or are they observed only in organisms with asexual reproduction? so what do we mean by pre -zygotic? well, simply put, isolation that takes effect before the production of a zygotes.
00:28
So there are different types.
00:29
We have ecological, we have temporal, we have behavioural, we have mechanical, and we have gametic.
00:38
These are the five types of pre -zygotic isolation.
00:42
All these happen before we get a zygote.
00:47
So what can we say? well, do they reduce the fitness of hybrid offspring? we don't know, because we don't get hybrid offspring because these are pre -zigotic.
00:56
Are they only found in animals, or are they only found plants? and neither of these is true.
01:02
We want both animal and plant examples...