What is the difference between a transgenic plant and a plant produced through selective breeding?

Transgenic plants are plants that have been genetically engineered, a breeding approach that uses recombinant DNA techniques to create plants with new characteristics. They are identified as a class of genetically modified organism (GMO).

Selective breeding involves choosing parents with particular characteristics to breed together and produce offspring with more desirable characteristics.

Explanation:

Using the definitions giving, so the difference would be that in transgenic plants they are created using DNA techniques such as electroporation, wherehas in selective breeding the plant is grown from naturally grown parent plants that are chosen through selection based on their superior character traits.

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the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.