00:01
In order to answer this question, let's talk about genetics.
00:04
It says, draw a cell with a chromosome number of 24.
00:08
It means that this is your cell, and this is a diploid number of four.
00:14
And it says, and genotype of, and this is the genotype here.
00:20
Hittalzygos a and hittotocytocytes b, where each gene is on a different chromosome.
00:26
Then he says, label each chromosome with its appropriate allele, okay, and draw out.
00:33
All stages of myosis using the cell below with a relevant stucous and chromosomes labeled.
00:39
So according to the figure that they are giving you, if this is your cell, and you have one chromosome like this, this is a, then you have the second allel that is a lowercase letter a, and then you have this allele for b, for the b gene, and this allel for the b gene.
01:08
Okay, so this is what you have.
01:10
And they are, are asking you to, well, the different number is four, and it says to draw all the phases of myosis using this cell.
01:22
So first, remember that before myosis starts, like interface of cures and dna application occurs.
01:31
So after that, after interface that includes a g1, is where dna application occurs in the g2 phase, your chromosomes are going to to move or we are going to compare from this shape to this shape here okay? this is only one chromosome because it has one centimeter here and this is also one chromosome because it also has one center here, okay? so this is one chromosome and this also one chromosome.
02:01
So your cell is going to be something like this.
02:12
A, this is a and like this.
02:18
Okay, so this is going to be your cell that it is also deeper, okay, like this.
02:25
And in this way, this cell is going to start myiosis.
02:29
First, myiosis 1.
02:30
In myiosis 1, you have prophs 1.
02:32
In prophs 1, what happens is that initially your cell is going to be like this.
02:37
Your cell, the nucleus, and here you have this, this, this, sorry.
02:56
And this and this.
03:00
Okay, so what happens in prophets? in prophesy, what happens is that the nucleus is going to disappear.
03:10
The nucleus membrane is going to disappear.
03:13
So your chromosomes are going to move to the cytoplasm and also the spindle is going to be start producing.
03:21
So this is prophase 1.
03:23
This is prophase 1.
03:24
Then after this, what happens is metaphys 1.
03:28
In metaphys 1, what happens is that in metaphase, the like the general thing that occurs is that the chromosomes align in the middle of the cell.
03:36
In this case of myiosis 1, as you have pairs of chromosomes, because this is one pair, this is another pair, the arrangement of the chromosomes during metaphases are going to be like this, like this, and like this.
03:54
It means they are going to align in the middle of the cell together.
03:57
Okay, each pair is going to align together.
03:59
So this is a, like this, this is the lower case, a, and this is the, one allele and this is the second elite.
04:12
Okay, so this is what metaphase 1 is going to look like.
04:16
This is the spindle.
04:19
These are the chromosomes and here you have the centrals where the micro tubules are produced.
04:24
So this is metaphase 1.
04:25
Then you have ana phase 1.
04:30
What happens in ana phase 1 is that your chromosomes are going to split or well, they are going to separate from each other.
04:39
Okay, as you have one pair here, then one chromosome is going to move here and this chromosome is going to move here.
04:45
Okay, and this is a random movement.
04:47
It means if this allele that is like the capital letter a moves here, it doesn't mean that this capital letter b is also going to move here because this can move here and also this can move here, or maybe this one with this one and like that.
05:04
Okay, so this is a random movement of chromosomes.
05:07
So in this case, let's suppose that both of them are going to move here and both of them are going to move here.
05:11
Okay? so you have that, the mitotic, well, the spindle in general, the spindle is going to move towards this pole and also this spindle is going to move to this pole and they are going to drag each of these chromosomes to the respective poles.
05:26
So you're going to have the following.
05:28
This is going to be your spindle and your chromosome here.
05:33
You're going to be dragged towards that place and the same for this chromosome here and then the same for.
05:45
This chromosome.
05:52
And this is ana phase one.
05:55
And finally, during tila phase one, what happens? you may know that, well, this is telophase in cytokinesis, okay? the cell, or well, the mitotic spindle is going to disappear.
06:06
Okay, your chromosomes are going to reach the poles.
06:09
And the nuclear envelope is going to again appear.
06:12
Okay.
06:12
So you have your nuclear envelope here, here, and you have one a here, another a here, one b here, and one b here.
06:28
Okay...