00:01
Ferns undergo alternation of generations in which a a, dominant sporophyte alternates with independent gametophyte.
00:09
B, dominant gametophyte alternates with dependent sporophyte.
00:12
C, sporophytes and gametophyte have equal lifespans.
00:16
D, the gametophyte produces gametes by meiosis.
00:19
E, the gametophyte alternates with a haploid zygote.
00:22
Okay.
00:24
Ferns, like all, landplants, have alternations of generations.
00:29
What does this mean? means they have both a haploid and a diploid stage, a multicellular haploid and diploid stage.
00:38
The haploid is called the gametophyte, and the diploid is called the sporophyte.
00:47
So let's go through some here that apply to all plants.
00:50
For example, if we look at d, does the gametophyte produce gametes by meiosis? well, no, it does not.
00:59
The gametophyte is already haploid.
01:01
It does not have to undergo meiosis to produce the...
01:05
The gametes.
01:07
Because it's already haploid, it has to undergo mitosis.
01:12
So it's not that.
01:15
That's just a general plant thing.
01:18
Okay, what else do we have here? so e is also in true.
01:25
The zygote is diploid.
01:27
So the zygote is what you get after fertilization.
01:31
And so you get it when two haploids fuse, the two haploid gametes fuse to get a diploid.
01:38
So the zygote is diploid...