00:01
Alright, so we're going to look at polyploidy.
00:05
More specifically, we're going to look at triploid plants like the banana, and why those don't produce viable offspring.
00:13
To start, i'm going to show the basic steps that happen when a diploid undergoes meiosis first, so that we can kind of follow along with it again when we do it with a triploid.
00:27
So this is going to be a single chromosome organism, basically.
00:34
Super simplified cell.
00:36
So we have the two sister chromatids here.
00:39
So then going into replication in that first part of myosis, the sister chromatids get replicated.
00:49
They get pulled apart.
00:52
And you wind up with daughter cells that are clones of the mother cell.
00:58
So where this becomes tetraploid for a little while, these both go back to being diploid cells.
01:08
And then in the second stage of meiosis, when these are now going to be split, but they aren't replicated.
01:18
So each sister chromatid gets lined up, and then one goes to each side of the cell.
01:29
You wind up with a distribution kind of like this...