Measures of DNA Content and Chromosome Content
The amount of DNA within a cell change following each of the following events:
We use ‘C’ to represent DNA content in a cell and ‘N’ to represent the number of complete sets of chromosomes.
In a gamete -- the amount of DNA is say, 1C
And the number of chromosomes say, 1N
Upon fertilization, both the DNA content and the number of chromosomes doubles to 2C and 2N respectively.
Following DNA synthesis, the DNA content doubles again to 4C, but each pair of sister chromatids is still as a single chromosome, so the number of chromosomes remain unchanged at ‘2N’
- Fertilization
- DNA synthesis
- Mitosis
- Meiosis
We use ‘C’ to represent DNA content in a cell and ‘N’ to represent the number of complete sets of chromosomes.
In a gamete -- the amount of DNA is say, 1C
And the number of chromosomes say, 1N
Upon fertilization, both the DNA content and the number of chromosomes doubles to 2C and 2N respectively.
Following DNA synthesis, the DNA content doubles again to 4C, but each pair of sister chromatids is still as a single chromosome, so the number of chromosomes remain unchanged at ‘2N’
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