Phenotype is the outward physical manifestation of an organisms (living things) determined by the genotype, which is the internally coded, inheritable, information called DNA.
The dog has long pink hair. Having long hair is a phenotype, but the pink coloring is a dye. The dog’s natural hair color is white.
All phenotypes are inherited and include the size and shape of a bird’s beak, and the spines on a cactus.
DNA stands for the chemical name, deoxyribonucleic acid.
While DNA might be considered a topic for high school, but elementary student can easily separate DNA. See the DNA Index for ideas for Extracting DNA.