In humans a rare dominant disorder known as nailpatella synd

In humans, a rare dominant disorder known as nail-patella syndrome causes abnormalities in the fingernails, toenails, and knee caps. Researchers have examined family pedigrees with regard to this disorder and, within the same pedigree, also examined the individuals with regard to their blood types. (A description of blood genotypes is found in Chapter 5.) In the following pedigree, individuals affected with nail-patella disorder are shown with filled symbols. The genotype of each individual with regard to their ABO blood type is also shown. Does this pedigree suggest any linkage between the gene that causes nail-patella syndrome and the gene that causes blood type?

Solution

Answer:

The pedigree indicates that the nail-patella allele is linked with allele I^B. So that the progeny who have allele I^B they have the syndrome nail-patella.