00:01
Hi, guys.
00:01
So we're looking at what a pollen grain is.
00:05
That is the question.
00:06
What is a pollen grain? so as you know, a plant is going to have, or land plan is often going to have a place to receive pollen that floats in the air that gives everyone allergies.
00:20
People are pretty familiar with pollen.
00:24
And the question here, is it a good meat ofite, a sporophyte, or sperm, and is it male or female? so the first thing you need to understand about many land plants is they have what is called an alternation of generation.
00:37
And this means that they alternate between a haploid and a diploid 2n state.
00:45
And as you should know, that is how many copies of chromosomes they have.
00:49
So for a plant often, you'll be in this 2n zygote state once the sperm or once the pollen fertilizes with the female.
01:00
I don't want to give anything away with the female gametophyte.
01:04
So you get this zygo, which will undergo myosis, and it'll get back to n.
01:10
So this is myosis.
01:12
Here, let me write that out.
01:17
Sorry, y 'all...