What are restriction enzymes and how can they be used to analyze the presence of different alleles?

What are restriction enzymes?

        Restriction enzymes are a protein made by bacteria that cleaves DNA at specific sites among-st  the molecule.

how can they be used to analyze the presence of different alleles?

         Restriction enzymes are used to cut DNA into smaller fragments. The cuts are 99% always made in a specific nucleotide sequences. Different restriction enzymes recognize and cut into many different DNA sequences.

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

answer'(basidium)the spore--bearing structure of a basidiomycete is called a basidiocarp; ///