Question

question 19
which is the best definition of genetic engineering?
variation in an organisms traits by natural variation of its dna
changing an organisms characteristics by manipulating its dna
modification of an organisms characteristics by maintaining its dna
full removal of an organisms characteristics by altering its dna

Explanation:

Genetic engineering involves directly manipulating an organism's DNA to change its characteristics. Natural variation (first option) is not genetic engineering. Maintaining DNA (third option) doesn't involve the manipulation key to genetic engineering. Full removal of characteristics (fourth option) is an extreme and inaccurate description compared to the purposeful manipulation in genetic engineering.

Answer:

changing an organism's characteristics by manipulating its DNA