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Polygenic Inheritance Questions Example: Finch Beak Depth Finches are seed eating birds that use their beaks to break open seeds. The depth of beak is under polygenic control of three genes with two alleles each. Produce the Punnett square for the following cross. Write only the number of dominant alleles in each cell of the Punnett square. Use this information to create a graph demonstrating the distribution of beak phenotypes. Allele key: A= add depth a= no depth added B= add depth b= no depth added C= add depth c= no depth added Cross: Two birds which are heterozygous at all three loci Example: Wild Columbine The height of the columbine plant is controlled by a polygenic system. Here there are two genes each with two alleles. Allele key: M1= Tall plant M2= Small plant N1=Tall plant N2=Small plant Cross: Two heterozygote’s at each loci Produce the Punnett square for this cross