Genetics Challenge Question

[Survivor39]

I am not sure if this is a good question or not, but for those of you who did the genetics option, or even the genetic topics, would have learned how the process of cloning works.

In the cloning of Dolly, one of the step invovles the extraction of udder cells from Sheep 1. These cells are important because the genome is going to be inserted into an egg from Sheep No. 2.

Scientist starve these udder cells (I'm not sure how, probably inoculate them into a nutrient limited broth). Why do you think this was done?

[currysauce]

So the cell doesn't start dividing????? The tissue culture medium is adjusted to starve cells and maintain them in the G zero stage of the cell cycle. During the G zero phase, the cell, viewed from this perspective, lives through a completely "altruistic" phase.

It can still survive... i think...

The G phase is shown in this picture...

[acmilan]

From memory, nutrient deprivation interrupted the normal growth and division cycle of a cell, thus allowing them to 'reprogram' it with the new nucleus

[Survivor39]

While you're still answering the first question, I've got another interesting, not necessarily "challenging", for you.

In one of your option textbook for genetics, the author wrote about the Human Genone Project:
"Because chromosomes occur in homologues, identical pairs, it is only necessry to sequence 24 chromosomes, that is, the X and Y, and one member of each of the other 22 pairs"

Do you see some minor error with this sentence?

[currysauce]

no clue, how'd i go on the first quesiton LOL

[Survivor39]

I'll PM you so it won't spoil the chance from everyone having ago.

[malkin86]

Originally Posted by Survivor39

While you're still answering the first question, I've got another interesting, not necessarily "challenging", for you.

In one of your option textbook for genetics, the author wrote about the Human Genone Project:
"Because chromosomes occur in homologues, identical pairs, it is only necessry to sequence 24 chromosomes, that is, the X and Y, and one member of each of the other 22 pairs"

Do you see some minor error with this sentence?

22 pairs and one X and one Y chromosome doesn't = 24 chromosomes, it equals 46.

[Survivor39]

No that's not it.
The author meant that you need to sequence 1 chromosome from each homologous autosomal pair (44/2 = 22 chromosomes), then sequence both sex chromosomes (2). Giving 24 chromosome sequences.

[k_stroud22]

Sorry, i have no idea....maybe 'homologues' is spelt wrong? *hides under the chair for her ignornace...*

[simplistic]

so there is no error ?
because the homologous r the same so u need one of each 22
but the x and y r diff so u need both therefor ull need 24

[simplistic]

hey can u post all the answers to the questions soon like b4 the bio hsc the questions r reallly brain boosters lol

[Survivor39]

Answer:

Are both copy of your chromosomes really identical? No. You could be heterozygous at cetrain loci. Then, therefore, your homologues are not completely identical.

[simplistic]

crossing over ?

[Dr_Doom]

Is the answer to the first question because if the enoculated egg doesn't have any cells inside of it, it will lyse. But if the activity is temporarily inhibited, it will preserve the egg until it is needed....?