00:03
So we want to determine information about this f1 generation.
00:07
So what we're going to do is take all of the different phenotypes and order them from the most common to the least.
00:14
So you'll see that i've started with the most common up at the top, and i'm just working my way downwards.
00:20
And as i do, you see that they come in inverse pairs.
00:24
So the top one has all dominant all dominant traits, and the next one has all recessive traits.
00:31
Now there's a couple of different reasons why we would order them like this.
00:35
And the first is that way we can identify non -recommonant types and recombinant types.
00:41
So we can even tell more information.
00:42
We can tell which ones are.
00:44
Parental types.
00:44
We can tell which ones experience.
00:46
Single crossing over vents and double crossing over events.
00:50
And then we can use that information to determine which gene is in the middle and how far apart genes are.
00:56
So now that i have them all, i'm going to start by looking at the top to most.
01:00
So these two, these two we would consider to be non -recommonant types or parental types.
01:08
So these offspring got chromosomes from their parents and there were no crossing over events that happened.
01:13
So all the rest of these down here are recombinant types.
01:18
And there's different types of recombinants, right? so these next two are a type of single crossing over event.
01:25
The next inverse pair is a different type of single crossover.
01:29
And the last two, the two least common are type of double crossover event.
01:34
Now those are the ones we're going to focus on here because we can compare our double crossing overs to the non -recommonant types to tell which genes in the middle.
01:44
So the reason why is in a double crossing over event, you have the middle gene that's sort of there, and the genes to either side will exchange alleles with the sister chromatid, meaning that now our middle gene is surrounded by new alleles and seems out of course.
01:59
Place.
02:00
So comparing double crossing overs with our non -recognites, we can see which gene seems out of place and is therefore a middle gene.
02:07
So our first non -recognite type, dominant, dominant, dominant, our most similar double crossover, dominant, recessive, dominant.
02:14
So you see there's one that's different, seems out of place, and that is likely our middle gene, but we'll compare the others just to be sure.
02:20
My other non -recomit type is recessive, recessive, recessive, double crossover, recessive, dominant recessive...