Gregor Mendel and Reginold Punnett
Gregor Johann Mendel:
He was born July 20, 1822 and died January 6, 1884. He had two siblings named Veronica Mendel and Theresia Mendel. His parents were Rosine Mendel and Anton Mendel. He contributed to genetics because of his discoveries. He said that genes come in pairs and are inherited as distinct units, one from each parent.
Reginald Punnett was born June 20, 1875 and died January 3, 1967. He wrote two books called Mimicry in Butterflies and Mendelism. He went to several colleges/universities including Clifton College and the University of Cambridge.
He contributed to genetics because he made the Punnett Square in the 1900s. His original punnett square looked like this:
The 1/2 means half of the DNA in the outside of the square and the 1/4 inside the square means it is 1/4 of the possible outcomes. It also gives the alleles like G, g, Gg and gg.