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Gregor Mendel's work is important because he´s the one that came up with the modern genetics and presented his research on experiments in plant hybridization which would show that traits from parents are passed down to their offspring.Gregor Mendel (the father of modern genetics)

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Friedrich Miescher´s work is very important because he´s the one that discovered the molecule from nuclei cells which he named ¨nuclein¨ Friedrich also had to do with the belief that proteins were the molecules in which traits are passed down from parent to offspring.
Friedrich Miescher (founder of the ¨nuclein¨)

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Rosalind Franklin´s work had a huge impact on DNA because  she ´s the one that took X-rays of crystallized DNA fibers to exam them. With examining the X-rays, she realized that the phosphates on the outside appeared to be a helical structure.
Rosalind Franklin´s X-ray of the crystallized DNA

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James Watson and Francis Crick's work is important because they gave a better picture of how genes are copied then passed down with constructing a model of DNA as a double helix. Then showing how hydrogen bonds pair the A-T and C-G bases. James Watson and Francis Crick with their DNA model

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Marshall Nirenberg's work is important because he was a big part of the discovery for the 60 mRNA codons for all 20 amino acids.Picture of protein synthesis

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Frederick Sanger's work is important because he is the person that developed the "rapid DNA sequencing" method. This method is now used all around the world to determine the order of basis in a strand of DNA. This happens when special enzymes are used to combine small pieces of DNA, which end when a chosen “terminating” base is added to the stretch of DNA being synthesized

Picture of DNA sequence

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DNA is made up of molecules called “nucleotides”. Every nucleotide has a phosphate group, a sugar group and a nitrogen base. The 4 types that make up the nitrogen base are (A)Adenine, (T) thymine, (G) guanine and (C) cytosine. Depending on what order these are in, it’s what determines the genetic code.

Picture of a DNA structure

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The Nucleotides of DNA consist of Cytosine, Thymine, Adenine, and Guanine. The 3 main parts of Nucleotides are, nitrogenous base, pentos sugar, and the phosphate group.

Picture of Nucleotide structure

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The nucleotides of DNA base pair by the pentose (5-carbon sugar) a nitrogenous base and phosphate groups. There are four different types of nitrogenous bases (A, G, C, T). Which then the nucleotides are all connected to each other by covalent bonds in each strand of DNA.

Picture of DNA base pairs