Purebreed is where both parents are the same breed to produce an offspring of the same breed.
I am: A) DNA
DNA is double-stranded molecule which is often also it's most known feature. Perhaps less known (depends on who you ask) are facts that it also has thymine and not uracil (uracil is found in RNA). It has four nitrogen bases and it contains deoxyribose sugar (another hint that it's DNA and not RNA).
Nucleic acids controls traits and inheritance.
Traits and inheritance are largely controlled by genes. Genes are the physical and functional units of heredity.
