At the metaphase plate during metaphase of mitosis, there are a. single chromosomes. b. duplicat

At the metaphase plate during metaphase of mitosis, there...

Key Concepts

Mitosis

Mitosis is a type of cell division where a single cell divides to produce two genetically identical daughter cells. It consists of several stages, including prophase, metaphase, anaphase, and telophase, with each phase playing a critical role in ensuring accurate separation of duplicated chromosomes.

Metaphase

Metaphase is a stage in mitosis during which chromosomes line up along the cell's equatorial plane, known as the metaphase plate. This alignment is essential for the proper segregation of chromosomes into the daughter cells in subsequent stages.

Metaphase Plate

The metaphase plate is the imaginary plane at the cell's center where chromosomes align during metaphase. This central position ensures that when the chromosomes separate, each daughter cell receives an equal and correct set of duplicated chromosomes.

Chromosome Duplication

Chromosome duplication refers to the process that occurs during the S phase of the cell cycle, where each chromosome is replicated to form two sister chromatids. These duplicated chromosomes are what align at the metaphase plate during metaphase, ensuring that each daughter cell receives an identical set of genetic information.

Transcript

00:01 For this particular problem, we are beginning to enter the realms of the cell cycle, specifically in mitosis.

00:08 Now, mitosis is essentially just cellular replication.

00:14 So cell, division, and replication.

00:20 That's right.

00:20 Cell division and replication.

00:23 Now, when we're looking at this particular problem, we're talking about one of the specific identifiable parts of mitosis, which is, during metaphase.

00:34 So there's a few different parts of mitosis.

00:36 We have prophase.

00:39 We have metaphase.

00:42 I'm abbreviating all these.

00:44 Anaphase and then telephase and then kind of cytokinesis in there we can distinguish them apart from one another but they are commonly looped together just to form these four different significant portions and now we're looking at metaphase which is portion two so let's just draw out what we'd expect at metaphase so if this big circle is a cell and we have all these different chromosomes that were originally inside the nucleus so let's just do it before and after we're doing a cellular transformation a glow up, you could say.

01:16 So here's our nucleus.

01:17 And then in the beginning, we have these chromosomes, right? like here, we have the x.

01:22 We have the centromere, which i'm thinking is distinguishable circle.

01:28 And we have these different chromosomes.

01:29 Let's just do three double -stranded chromosomes, as we can see, double -stranded because we see that there's four arms, right? these arms of the little thing sticking out that we would identify as arms and a stick figure.

01:44 So this is the before.

01:45 And, and we have the after.

01:48 Now we have the after.

01:49 But let's just call it metaphase, because that's actually the portion we're looking at.

01:53 So with metaphase, we still have the cell.

01:55 I'm changing to color of the red, but don't worry too much about that difference.

01:59 And then if we have an identifiable portion of the cell called the metaphase plate or the metaphysioplate, which kind of bisects, meaning splits into two, splits the cell into two parts.

02:11 And what we see is that this nucleus that once existed, it starts to disintegrate.

02:16 And then we don't really have to worry about it, constricting and binding chromosomes to one place.

02:22 So as this fades away, so these arrows are indicating that this red nucleus starts to disintegrate, the chromosomes are more free, and they line up in the middle of the cell, such as this.

02:37 This is what we would see.

02:41 Okay? this is metaphase, and it's easy to think about metaphase because i just think of middle.

02:46 Meta for middle.

02:47 They're lined up in the middle of the cell.

02:49 So this is just a rough illustration of what's occurring.

02:53 There's more going on, but we don't need to dive too much further into that for now.

02:56 So now we need to answer some or identify which of these answer options applies to this stage of mitosis.

03:04 So we have answer d.

03:06 I'm just going to go through the different answer options.

03:08 There's always 23 chromosomes.

03:11 Now in case you didn't notice or not didn't notice, in case you weren't familiar already, humans have 23 pairs of chromosomes leading for a total.

03:18 Number of 46.

03:21 Now this number is different for other organisms and mitosis actually occurs in other organisms besides humans.

03:27 We're not all that special in regards to this process...

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