A molecule of DNA consists of two strands of various chemical compounds that other chemicals carrying genetic information join together, much like ladder rungs hold ladder rails apart. The two strands joined with thousands of rungs look like a long rope ladder that has been twisted into the shape of a spiral, called a double helix.
DNA double strand
You can tell a chromosome has doubled because of the DNA's strands. They coil very tightly.
If one dimension of a 3-dimensional shape is doubled, the volume increases by 21 = 2. If two dimensions of a 3-dimensional shape are doubled, the volume increases by 22 = 4. If all three dimensions of a 3-D shape are doubled, the volume increases by 23 = 8.
In the last ten years, the population of the planet has doubled.
Yes. Genes are composed of DNA, and DNA replication occurs during interphase. This is when the chromosomes are doubled.
DNA is doubled during the S (synthesis) phase of the cell cycle. This is when DNA replication occurs, leading to the formation of identical sister chromatids that are attached at the centromere.
The shape of a DNA Molecule is a Double Helix
two
the new area will be fourfold, not doubled. try it on squared paper and see how the shape increases from one square into four...
2
4
The shape of a DNA molecule is called a Double Helix or a "Twisted Ladder"