Punnett squares are named for an English geneticist, Reginald Punnett. He discovered some basic principles of genetics, including sex linkage and sex determination. He worked with the feather color traits of chickens in order to quickly separate male and female chickens.
Capital letters represent dominant traits, and lowercase letters represent recessive traits.
These are often given to you or are possible to determine. List the genes that each parent can contribute. Draw a Punnett square - 4 small squares in the shape of a window. Fill in each box of the Punnett square by transferring the letter above and in front of each box into each appropriate box. As a general rule , the capital letter goes first and a lowercase letter follows .