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Several basic questions concerning DNA..urgent:)

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Re: !

Postby zami'87. » Fri May 06, 2005 5:37 pm

Imemine wrote:CUU is correct, i've checked it.
What about my other questions?
Please reply in the next 20 minutes, or it wouldn't be much of a help anymore..
tnx.

I know it is correct if we don't go in details! :x
For other questions I'm in a hurry today sorry :cry: I'll answer tomorrow.Ok :) ?
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o.k

Postby Imemine » Sat May 07, 2005 6:21 pm

Lol..alright, but I trust in you.
Please answer the list of circa 5 questions that I've posted yesterday.
Farewell.
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Re: o.k

Postby zami'87. » Mon May 09, 2005 8:33 pm

Imemine wrote:Lol..alright, but I trust in you.
Please answer the list of circa 5 questions that I've posted yesterday.
Farewell.

1)What is the situation of the chromosomes during metaphase II and what is their situation in the gametes?
If the original cell has 2 pairs of homologic chromosomes then in metaphase II you get 2 cells each with 1 homologic chromosome(but each hromosome has 2 hromatids-2 DNA molecules). Then in anaphase II 2 chromatids separate so you have cells that have 1 homologic chromosome(from chromatid) with 1 DNA molecule-gametes.You get 4 gametes(from 2 cells in metaphase II) .
2)When do the microtobules connect to the centrometers?Is it positive that in the mitosis, as well as in the miosis I and II?
In metaphase in mitosis and in meiosis I and II.
3)In the genes order question, is the order of A B C of the genes on the chromsomes identical to C B A or is different?
Well I think it is different if you mean on location cause you count from centromere to telomeres(end of chromosome).But if that is a school example it’s ok.
4)What is the proportion of homozygote recessive breedings, in a self hybrid of a planet, which is(the planet) hytrozygote to 3 mendalic properties?
Cross AaBbCc*AaBbCc . 1 in 64 (1/64).Draw punnett square.
5)A pumpkin's weight is decided by two genes. Each allel of gene presented by a big letter, donates 2 kilograms, small letter-donates 1 kilogram. Genotype AABB esults in 8 kilo, aabb in 4 kilo..
In a hybrid of a hetrozygote with a recessive homozyogte, what will be the proprion and weights of the fruits?
If you mean AaBb* aabb. Draw punnett square.
16 cases. 1/16- 8kilos,2/16- 7kilos,4/16-6kilos,2/16-5kilos,1/16-4 kilos.
Maybe with mistakes... :roll:
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...

Postby Imemine » Tue May 10, 2005 3:30 pm

Thanks for the reply(though late), but...
1)concerning the 1st question about the chromosmes, i'm afraid you misunderstood it, or you may have a mistake.What is the situation of the chromosmes in the cell? It's only one cell, that had two pairs of homologic chromosmes.the answers can be oe homolog chromsome, 2 h c, a pair of connected h chromosmes, or 2 pairs.Same counts for thesutuation of the chromosmes in the gamettes..So you must use either of these 4 answers, and remember that in the first question there's only one cell.

2)Concerning the pumpkins..Your answer didn't include all possible combinations (don't sum to 16)..It may be 1/4-6, 1/2-5,1/4-4 or 1/16-2, 1/16-4,1/4-5,1/4-1,3/8-3 or 1/4-3, 1/2-2.5,1/4-2 or 1/16-3,3/8-4,1/16-25,1/16-1,1/8-3.
I do not understand how can the optional combinations can sum up to less than 16, or how can there be a situation in whcih the fruit weighs only 1 kilogram. So what of the four is it?

*About your other answers..'Fraid they're right

Thanks, and please reply fast. :wink:
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Re: ...

Postby zami'87. » Tue May 10, 2005 5:39 pm

Imemine wrote:Thanks for the reply(though late), but...
Thanks, and please reply fast. :wink:

for pumpkins you're right I crossed AaBb*AaBb.When you want to do something fast..... :oops: :oops: but for meiosis.Again? :shock:
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hmm

Postby Imemine » Tue May 10, 2005 7:31 pm

It's alright. If you understood the pumpkins matter, then what is the answer out of the four possible answers?
And about the chromosomes, i'll simply put it:The answer for both parts of the question (which is already known to you) must be of the following: one homologic chromosme, two separate homlogic chromosmes, a connected pair of h..chromsomes, or 2 connected pairs of 'em. Use 2 of these 4 answers to describe the situation under the given limitations.
Then what are the answers for the pumpkins, the chromosmes in the cell during II and in the gametes?

Appreciate it.
P.S.
Male/female?
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