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Introduction to Mendelian Genetics

Author(s): Lisa M. Meffert, PhD

Crossing the F1 Generation: Male Contribution

We'll now cross two heterozygotes (the F1) that resulted from our original parent cross (P), TT x tt.  First, write the two possible alleles that the  male contributes to the Punnet square above. Then, write the the two possible alleles that the female can contribute on the left-hand side of the Punnet square. Write the alleles that the male contributes to the offspring in each box, going down.