Skin stem cell at the g2 checkpoint of the cell cycle contains 14 chromosomes but twice the amount of dna as one in the g1 stage

Question

sergey [27]

3 years ago

11

Skin stem cell at the g2 checkpoint of the cell cycle contains 14 chromosomes but twice the amount of dna as one in the g1 stage

. the diploid (chromosome) number for this species is

Biology

2 answers:

kotegsom [21] · Answer 1 · 2022-02-03T09:42:02+03:00

kotegsom [21]3 years ago

5 0

The diploid number for the specie is 14 chromosomes. Diploid means the paired chromosomes as opposed to haploid which is 7 chromosomes.
G2 or gap 2 phase of the interphase is where DNA synthesis occurs and where the chromosomes are replicated to generate sister chromatids.

pickupchik [31] · Answer 2 · 2022-02-03T11:11:19+03:00

The diploid chromosome numbers will be 14 for this species.

Further Explanation:

The chromosomes present in the nucleus of the cell represents the diploid chromosome number. It is written as 2n, where n is the chromosome number. For example, in humans 2n=46 and n=23.

The process of cell division involves G1, S, G2, and M phase. The G1 phase is the phase between the mitosis and the replicative phase. It is the growth phase during which the cell synthesizes proteins and enzymes required for the S phase. Therefore, in this phase, the chromosome number and the DNA content remains intact.

In the S phase, the chromosomes undergo replication with each chromosome having two sister chromatids. During the S phase, the DNA content is doubled (4n) but the cell ploidy (2n) remains unaffected.

The S phase is followed by the G2 phase in which the cell synthesizes the protein machinery for the mitosis to take place. It is during mitosis when actual cell division takes place and the DNA content is divided equally among the two daughter cells with each cell containing 2n number of chromosomes.

Here, the G2 phase contains 14 chromosomes. The cells in the G2 phase has double DNA content due to the preceding S phase. In this case, every chromosome remains attached to its sister chromatids, therefore the ploidy remains the same but the DNA content increases.

Therefore, this species has diploid chromosome number as 14 and the DNA content has doubled to 28 sister chromatids in the G2 phase. These sister chromatids will be divided among two daughter cells equally by the end of mitosis.

Learn more:

1. Learn more about meiosis brainly.com/question/1600165

2. Learn more about the process of molecular diffusion in a cell brainly.com/question/1600165

3. Learn more about human sperm and egg cell brainly.com/question/1626319

Answer Details:

Grade: High School

Subject: Biology

Chapter: Cell cycle and Division

Keywords:

Cell cycle, cell division, G2 phase, S phase, G1 phase, M phase, mitosis, daughter cells, diploid chromosome number, replication, DNA, sister chromatids.