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Question
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 __.
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Solution
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 is doubled as the chromosomes are replicated. 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 at 2n.
Compared to a gamete (haploid, n) of the same species, the amount of DNA will be four times to it and the chromosome number in the somatic cell 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 is doubled as the chromosomes are replicated. 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 at 2n.
Compared to a gamete (haploid, n) of the same species, the amount of DNA will be four times to it and the chromosome number in the somatic cell will be twice that in the gamete.
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