The given pedigree below is of a genetic condition which gives affected individuals a star-shaped mark on their neck. The shaded individuals all carry this mark.
A. Is this an example of a dominant or recessive pedigree? How do you know?
B. What is the genotype of I1 and I2?
C. What is the chance that the offspring of III-2 and III-5 will be affected? What about if III-3 and III-5 mated?
Following the basics of pedigree, the shaded individuals are affected, the square are the males and the circles are the females. Pedigree analysis cannot really bring up the genotypes of the individuals. With it, it can be seen that in the frst generation, only the mae is affected. In generation 2, 2 sisters and a boy were affected. Lastly, III-3 is the only individual affected in the 3rd generation.