Read This! When homologous chromosomes align in the center...

Read This! When homologous chromosomes align in the center of the cell during Phase Cl of Model 1, the orientation of one pair of homologous chromosomes is independent of the orientation of any other different pair of homologous chromosomes (either homologous chromosome of a given pair can be on the "left" or the "right" side of the cell in Phase Cl of Model 1, independent of any other pair). This is known as independent assortment, and it means there are different possible outcomes of Phase Cl, which affects the genetic makeup of the resulting gametes. Model 3 -Alternative possibilities from independent assortment in Meiosis I and II Assortment possibility 1: Assortment possibility 2: DNA Replication Meiosis I Meiosis II a.) Without looking back to Models 1 and 2 (if possible) illustrate the outcomes of DNA replication, Meiosis I, and Meiosis II in the diagram provided above. Each arrow is labeled to represent a given process (e.g., DNA replication). Your diagrams should incorporate the concept of independent assortment into them, meaning that ultimately the gamete outcomes in the diagram for "assortment possibility 1" should look different than the diagram for "assortment possibility 2". Make sure you label the alleles that correspond to each gene. For your diagrams, assume no chromosomal crossing over takes place. b.) List all the possible genotypes of the resulting gametes from Model 3. c.) How does independent assortment impact the genetic diversity of the gametes produced during meiosis? Why?

Transcript

00:01 Not to answer this question let's talk about inheritance in myiosis.

00:04 Here you have alternative hypothesis or probabilities for independent assortment in myosis 1 and myiosis 2.

00:11 So here it says assorment possibility 1 and assorment possibility 2.

00:16 It is without looking back to models 1 and 2, illustrate the outcomes of dna replication in myiosis 1 and myiosis 2 in the diagram provided above.

00:27 So after dna replication, what is going to happen for these two chromosomes? is the following.

00:32 From being like this, they are going to become like this.

00:38 So in this case you're going to have, let's do it in black, okay? you have here the dominant a, dominant a, decisive b, for this is if b.

00:53 For this chromosome, let's do it in blue.

00:58 You have this is a, decisive a, dominant b, then here you have this is a, c, dissive c, dominant c, dominant c, okay? something like this.

01:20 And well, you have the same here.

01:22 So this is what you have.

01:23 Now it says, let's see what happens during independent assortment.

01:28 For example, for the first possibility, this is going to be your chromosome.

01:34 In myosis 1, it is going to be something like this.

01:48 Here you have dominant a, dominant a, decisive v, excessive v, excessive v, excessive a, excessive a, dominant b, then here you have, you have here, this is c, c, and dominant c, and dominant c, okay? so what happens during independent assortment in myiosis 1? what is going to happen is that one of these chromosomes randomly is going to move to this pole, and the second chromosome is going to move to this pole.

02:36 And in this case, also randomly each of these chromosomes is going to move to different poles.

02:40 It doesn't mean that both black chromosomes are going to move together.

02:43 It is not like that, okay? it is a random process.

02:45 So if this chromosome black here and this black chromosome moves here, then both of these black chromosomes are going to be together in a dollar cell.

02:55 For example, in this case, you're going to have the black chromosome here.

03:01 Well, this is actually like this, like this.

03:12 And like this, this is a blue, this is a blue chromosome, remember, okay? i guess we're leaving black.

03:18 This is a blue chromosome.

03:20 And also this one here.

03:24 So these two are black chromosomes, this one, and this one are gonna be here.

03:28 You have the dominant a, dominant a, decisive b, this is if b, recessive c, and recessive c.

03:38 Now, in this cell you're going to have these two chromosomes that are moving together.

03:42 So you have here the two blue chromosomes, excessive a, decisive a, dominant b, dominant b, and here you have the dominant c and dominant c.

04:01 Now what happens during myosis two? during myiosis 2, what is going to happen is that you're going to divide your chromosomes like this, in a vertical way, like this, and the two chromates are going to be separated, and each of them is going to move to two different poles.

04:20 So in this case, you're going to have here, dominant a, b, here, dominant a, bcissive b, and for this chromosome, you're going to have decisive c, and here in recessive c.

04:35 So this is what happens.

04:37 And for the blue chromosome, the same is going to happen.

04:42 This and the dominant c here and the same here.

04:48 This is a, dominant b, and the dominion c...

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