00:01
If an error in meiosis produces 2n gametes instead of 1n, and they form a viable zygote, this is alapatric speciation, sympathetic isolation, polyploid speciation, habitat isolation, or behavioural isolation.
00:19
So, usually you would have a diploid germ cell, which would give you haploid gametes.
00:26
In this case, what we've got is we've got a case where the diploid germ cell, produced diploid gametes.
00:34
So what happens when they form a zygote, so normally, normally we would have the haploid gametes fusing to give a diploid zygote.
00:53
In this case, because the gametes have twice the usual number of chromosomes, they are fusing to give a tetraploid zygote.
01:02
So 4n instead of 2n.
01:06
What does this mean? let's go through the answers.
01:10
Allopatric speciation.
01:12
Allopatric means that there is geographical isolation involved.
01:17
So allopatric means geographical isolation.
01:23
If speciation occurs because of geographical isolation, it's allopatric in nature.
01:29
Simpatrick is the opposite.
01:31
Simpatrick is where they share the same region.
01:35
So it's any form of isolation that occurs when they're sharing the same range.
01:45
Polyploid is actually what we're seeing here...