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michaelgar7090
Joined: 11 Mar 2009
Posts: 11
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 Posted: Fri Jul 03, 2009 3:31 pm Post subject: Question 40 |
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Maybe I am just totally confused, but I think questions 39 and 40 are weird.
I don't believe there is a tetrad during mitosis.
There's a tetrad during meiosis, formed when two homologous chromosomes (which have already replicated) come together in prophase I. The word tetrad refers to the four chromatid of the homologous pairs that associate during meiosis, not to chromatid during mitosis. There are never 4 associated chromatid during mitosis; the homologous chromosomes do not associate during mitosis, and a chromosome never ever has more than 2 chromatid...
Please see my question on #39 which goes into more detail. |
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jellywing_2058
Joined: 04 May 2009
Posts: 179
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| Posted: Mon Aug 31, 2009 1:49 pm Post subject: |
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| This explanation has also been clarified. A drawing will also be added to this explanation. |
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dltkdgn896512
Joined: 26 Jun 2010
Posts: 36
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| Posted: Wed Jun 30, 2010 3:53 pm Post subject: |
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I think this question is poorly worded.
Can't this question be interpreted exactly as #39? |
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RichardParker
Joined: 26 Nov 2010
Posts: 11
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| Posted: Sun Dec 12, 2010 11:16 am Post subject: |
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The key to solving this is the first line of the question "After cells were transferred from the 3H-thymidine medium into the colchicine and 3H medium.."
Which means that cells from the previous question were used, where one strand is labeled and the other is unlabeled.
L-U (after one round in 3H medium) = L-L / U-L (after another round of replication in 3H, but because of Colchicine no segregation takes place) |
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