How many copies of the genome does a cell contain after the s phase of the cell cycle?

Answer and Explanation:

By the end of the S phase, the cell contains two entire copies of its genetic information. The cell proceeds to G2 phase when the chromosome starts condensing, and structures required for division are formed. A discrete band of microtubules (pre-prophase band) forms around the cytoplasm in a ring where the edge of the phragmosome lay, again marking the plane of cell division. G2 phase ends with the onset of prophase in which the cell’s chromatin condenses into chromosomes.At the end of the G2 phase, the cell undergoes another checkpoint: G2/M checkpoint, upon which, if conditions are appropriate then the cell proceeds to M phase where it divides.

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c