Contrast the genetic content and the origin of sister versus nons...

Question

Contrast the genetic content and the origin of sister versus nonsister chromatids during their earliest appearance in prophase I of meiosis. How might the genetic content of these change by the time tetrads have aligned at the equatorial plate during metaphase I?

Accepted Answer

Everyone. Let's take a look at this question together. Which of the following statements about non sister chroma tides is true. So let's recall what we know about chroma tides. Specifically non sister chroma tides. To try to figure out which of the following statements about them is true. So let's first start off by drawing two homologous chromosomes to compare sister chroma tides to non sister chroma tides. Since this question is asking us specifically about the non sister chroma tides. So here we have two homologous chromosomes and we know that we have here are our sister chroma tides and they're called sister chroma tips because they come from the same chromosome. And so over here we have another pair of those sister Roma tides. However, we're talking about the non sister chroma tides. So that would be this one and this one are non sister dramatics. And so what do we know about non sister chromatic in relation to the answer choices? Well, answer choice A says they are identical. Which we know is false because they come from two different chromosomes. So they cannot be identical. Answer choice B says they are joined together by a central mir. Which is also false because that's only true for those sister chroma tides. Since here is that central mere. So here is the central mirror, which the sister chroma tides are joined together by and not the non sister committed. So answer choice B is also incorrect answer choice C says they contain different alleles, which we know is true because they come from two different chromosomes. So they contain different alleles. So answer choice C. Is true. And, lastly, Answer Choice D. Says they separate from each other during an eight phase, which is false because this occurs in the sister chroma tides because they are part of the same chromosome. So answer choice C is the only statement here about non sister chroma tides. That is true and the others are all not true regarding the non sister chroma tides. So it can only be answer choice C. I hope you found this video to be helpful. Thank you and goodbye.

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Contrast the genetic content and the origin of sister versus nonsister chromatids during their earliest appearance in prophase I of meiosis. How might the genetic content of these change by the time tetrads have aligned at the equatorial plate during metaphase I?