SOLVED: When Are Sister Chromatids (in/from The Same ... - Numerade

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When are sister chromatids (in/from the same chromosome) equivalent to each other? ? Before crossing over in meiosis I. ? Before crossing over in meiosis II. ? Throughout meiosis I. ? Throughout meiosis II. ? Throughout mitosis. When are sister chromatids (in/from the same chromosome) equivalent to each other? ? Before crossing over in meiosis I. ? Before crossing over in meiosis II. ? Throughout meiosis I. ? Throughout meiosis II. ? Throughout mitosis.

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Biology for AP Courses Julianne Zedalis, John Eggebrecht

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Submit Thanks for your feedback! When are sister chromatids (in/from the same chromosome) equivalent to each other? Before crossing over in meiosis I. Before crossing over in meiosis II. Throughout meiosis I. Throughout meiosis II. Throughout mitosis. Play audio Feedback Powered by NumerAI

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Transcript

00:01 Okay, you want to answer this question, we have to talk about chromosomes and chromatins. 00:04 Remember that this is one chromosome, okay? it's one chromosome that has not developed dna replication yet. 00:11 Okay? and when this chromosome develops dna replication, it's going to become like this. 00:18 Okay, this is still only one chromosome because we count chromosome by the number of centromers. 00:24 Okay, so this is one chromosome. 00:26 And remember that this segment here is going to be one chromatic. 00:32 And this segment here is going to be another chromatid. 00:41 Okay, the blue one is one chromatid and the second one is the great one is another chromatid. 00:47 As this great one is a result of dna replication of the blue chromosome or the blue chromatid, then it is going to have the same genetic material as this. 00:59 The question says, when are sister chromatids, it means these two chromatics here, when are they equivalent to each other option a says before crossing over in myiosis 1 so myiosis 1 starts this is a cell okay and this is your nucleus okay let's let's draw two homologous chromosomes here okay so this is before myiosis 1 what is going to happen during myiosis 1 well during my during myiosis 1, during myiosis 1, or after myiosis 1, well, first during myiosis 1, what is going to happen is that first during prophase 1, the nuclear membrane is going to disappear. 01:46 And also during prophase 1, this is going to cure crossing over. 01:48 It means one segment here is going to be exchanged with the monobulus chromosomes. 01:53 You're going to have one great second here and another blue segment here. 01:57 So just up to there, it means during myosis 1, we can say that this chromatid is not the same as this chromatids here. 02:06 So sister chromatids are not the same because of crossing over. 02:09 So practically before crossing over is correct and this is the answer for this question. 02:14 Okay, then let's look also for the other options option pieces before crossing over in myosis 2. 02:19 This is false because crossing over occurred only in myosis 1. 02:23 Option 6 says throughout myiosis 1. 02:28 Well, this is also false because as we saw here, like just at the beginning of myiosis 1 when crossing over occurs, these sister chromatids are not the same anymore because of this crossing over here that is particularly the exchange of genes between these homologous chromosomes. 02:46 Then option this is throughout myosis 2. 02:50 So the result of this myosis one is going to be two dorses... Need help? Use Ace Ace is your personal tutor. It breaks down any question with clear steps so you can learn. Start Using Ace Ace is your personal tutor for learning Step-by-step explanations Instant summaries Summarize YouTube videos Understand textbook images or PDFs Study tools like quizzes and flashcards Listen to your notes as a podcast

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