BIO question

[299678]

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During which of the following stages of the cell cycle will a diploid cell contain twice the amount of DNA found in a gamete?
a) prophase
b) entire S phase
c) entire G1 phase
d) Entire G2 phase
e) metaphase

 

[khakwanit1]

I think its G1

 

[prsndwg]

G2 is also a good bet

 

[redchesus]

Well, a gamete is haploid so anytime you have diploid cells WITHOUT sister chromatids, you would have 2x the amount of DNA

I'd say G1. The cell replicates DNA during S phase, so from that point on all the way through the end of mitosis, you have 4x the amount of DNA as a gamete...

someone confirm, I think I'm right though

 

[Avery07]

G2 is also a good bet

How is this possible?? In G1 it will have just finished mitosis and each daughter cell will consist of 2n chromosomes with one chromatid each. It will be that way throughout G1. As it enters S phase, replication occurs thus making the cell have 2n amount of chromosomes consisting of two chromatids each. It will then be this way throughout G2.

G1 you have 2x DNA (on 2n amount of chromosomes)
S you replicate DNA (2x-->4x)
G2 you have 4x DNA (on 2n amount of chromosomes)

The answer is C: G1 👍

 

[winnie bear]

During which of the following stages of the cell cycle will a diploid cell contain twice the amount of DNA found in a gamete?
a) prophase
b) entire S phase
c) entire G1 phase
d) Entire G2 phase
e) metaphase

G1 because S phase is when DNA synthesis occurs (4x DNA of gamete) so from there on, a diploid would have 4x the amount of DNA compared to the haploids.

Most of our cells are in G0 phase as diploids (twice the amount of DNA found in a gamete/haploid) until a signal triggers the cell to enter the growth phases.

 

[299678]

yeah G1 is correct answer
then, someone can answer these questions?

How many molecules of DNA are in the pro-metaphase?
How many molecules per chromosomes?
How many double helices are there per chromosomes?
How many double helices are there per chromatid?

 

[prsndwg]

yeah G1 is correct answer
then, someone can answer these questions?

How many molecules of DNA are in the pro-metaphase?
How many molecules per chromosomes?
How many double helices are there per chromosomes?
How many double helices are there per chromatid?

I am not 100% certain, but I highly doubt you see any of these on your Dday. I took genetics and we went in too much details. dont remember covering the # of molecules or helices.. eventhough i remember something about every two rotation is something.
See if campbell has covered them, if not, then you shouldnt worry about it imo

 

[redchesus]

off the top of my head so not 100% sure:

at prometaphase (for humans) you still have 46 chromosomes per cell with 2 chromatids each so 92 molecules, 2 molecules per chromosome (the chromatids)

that means you have 2 double helices per chromosome, and 1 double helix per chromatid (I don't see how you can have anything besides 1 helix per chromatid...)

Compare this to after mitosis, where one chromatid is considered a chromosome, so at that point you have 1 double helix per chromatid AND 1 double helix per chromosome, 1 molecule DNA per chromosome, 46 molecules

once again, someone confirm