Step 4
The characteristic “spotted” is coded for by the recessive allele a. Primo ('1', see above) has a plain coat because he is homozygous for the dominant allele. Secundas ('2') first question is: “What is the chance of having spotted offspring if I choose to reproduce with Primo?” Work out your cross on paper and give an answer to that question expressed in a percentage.
Tertio ('3') is heterozygous for this characteristic. Work this cross out on paper too and see what chances Secunda has of getting spotted children with Tertio.
Tertio ('3') is heterozygous for this characteristic. Work this cross out on paper too and see what chances Secunda has of getting spotted children with Tertio.