There is no recombination among the offspring of these parents (generation II), but there are two instances of n n

7.16 Linkage between ABO blood types and nail-patella syndrome was established by examining families in whom both traits segregate. The pedigree shown here is for one such family. Solid circles and squares represent the presence of nail-patella syndrome; the ABO blood type is indicated in each circle or square. The genotype, inferred from phenotype, is given below each square or circle.

recombination among the persons in generation III. Individuals II-1 and II-2 have the following genotypes:

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