A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has
A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has
The correct option is D Twice the number of chromosomes and four times the amount of DNA
After the S phase, the amount of DNA gets doubled due to replication. Following replication, each chromosome now consists of 2 sister chromatids. Thus, the amount of DNA in the cell has effectively doubled but the chromosome count of the cell remains the same (2n).
A gamete, which is a product of meiosis division, has half the number of chromosomes (n). The chromosome number gets reduced in the first meiotic division. In the second meiotic division or meiosis II, the already duplicated chromatids also separate, thereby, bringing down the number of DNA as well. Therefore, compared to the gamete of the same species, the amount of DNA in a somatic cell will be four times to it and the chromosome number will be twice that in the gamete.
Twice the number of chromosomes and four times the amount of DNA
After the S phase, the amount of DNA gets doubled due to replication. Following replication, each chromosome now consists of 2 sister chromatids. Thus, the amount of DNA in the cell has effectively doubled but the chromosome count of the cell remains the same (2n).
A gamete, which is a product of meiosis division, has half the number of chromosomes (n). The chromosome number gets reduced in the first meiotic division. In the second meiotic division or meiosis II, the already duplicated chromatids also separate, thereby, bringing down the number of DNA as well. Therefore, compared to the gamete of the same species, the amount of DNA in a somatic cell will be four times to it and the chromosome number will be twice that in the gamete.
