genetics problem, please help

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undrgrad08
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genetics problem, please help

Post by undrgrad08 » Wed Nov 30, 2005 4:03 am

im really stuck on this question. the question says a skin cell undergoes mitosis. for unknown reasons, the centromere of one of the two number 4 chromosomes fails to divide. describe the resultant chromosomal content of the 2 daughter cells. supposed this happened to a single cell in reproductive tissue undergoing meiosis 2 after going through meiosis one normally. what would be the chromosomal content of the resulting cels from this cell?



thanks in advance

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Post by canalon » Wed Nov 30, 2005 4:33 am

Well if your chromosome 4 fail to divide, How do you imagine that the DNA is parted between the 2 daughter cells. Keep in mind that nothing is thrown away... Shouldn't be too hard.

Now take a look at how meiosis happens, and try to figure out what would happen then.

I guess you just discovered the secret of trisomy.
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Post by Terry K. » Wed Nov 30, 2005 2:38 pm

Yeah, it would end up in a trisomy of that chromosome pair, and the other set would either end up with nothing or a female, due to females having a dormant sex chromosome b/c they already have all the necessary information on that first chromosome so the other one lies in wait if anything should happen.
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Post by canalon » Wed Nov 30, 2005 3:26 pm

Terry K. wrote:Yeah, it would end up in a trisomy of that chromosome pair, and the other set would either end up with nothing or a female, due to females having a dormant sex chromosome b/c they already have all the necessary information on that first chromosome so the other one lies in wait if anything should happen.


We are talking about chromosome 4... not exactly an autosome.
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Post by MrMistery » Wed Nov 30, 2005 7:07 pm

Chromosome 4 is not an autosome?
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Post by canalon » Wed Nov 30, 2005 7:15 pm

Oooppps again. I meant a sexual chromosome. I am really making a fool of myself those days. But why multiple chromosomes with different names, anyway? Who needs more than a unique chromosome and a few plasmid for fun?
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Post by MrMistery » Wed Nov 30, 2005 7:17 pm

LOL... i thought i had studied the human caryotipe for 2 weeks for nothing.. :lol:
PS: some people like to see their lab animals...
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Post by canalon » Wed Nov 30, 2005 7:21 pm

MrMistery wrote:LOL... i thought i had studied the human caryotipe for 2 weeks for nothing.. :lol:
PS: some people like to see their lab animals...


If you see them they see you, and they can bite/scratch/defend themselves. While if infected by bacteria, that's your fault for not respecting safe handling techniques.

And with bacteria you can make plenty of things like streaking to form words, decorate the lab for christmas with Petri Dishes,.... Mice do not like to be dressed as Santa :lol:
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Post by MrMistery » Wed Nov 30, 2005 7:23 pm

Yeah, but if you work with plants you can get a chrismas tree for free..(for "research")
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Post by canalon » Wed Nov 30, 2005 7:27 pm

MrMistery wrote:Yeah, but if you work with plants you can get a chrismas tree for free..(for "research")


And all fruits and vegetables you need too. Picked ripe and fresh. Oh so tasty...
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Post by MrMistery » Wed Nov 30, 2005 8:11 pm

Yeah... But then you just have to hope that you experiments were succesful and you are not eating poison :lol:
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Post by canalon » Wed Nov 30, 2005 9:47 pm

MrMistery wrote:Yeah... But then you just have to hope that you experiments were succesful and you are not eating poison :lol:


We eat the control experiments, the untreated controls ;)
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