I was creating a database for biology and reference matierials, but i stumbled onto this? is 9.) not supposed to be Rr is the key incorrect?

Question

https://migrc.org/wp-content/uploads/Autosomal-Dominant-Inheritance-Example-Pedigree-Answers.pdf

https://migrc.org/wp-content/uploads/Autosomal-Dominant-Inheritance-Example-Pedigree-Answers.pdf

Answer 1

After reviewing the provided Autosomal Dominant Inheritance Example Pedigree Answers document, I can confirm that there is an error in the key for individual 9. Since both parents of individual 9 are heterozygous (Rr), the possible combinations of alleles for individual 9 should be RR, Rr, rR, and rr.

However, in the key, individual 9 is marked as rr, which is incorrect for an autosomal dominant inheritance pattern. Instead, individual 9 should be marked as Rr to indicate that they carry the dominant trait (as shown by the shaded symbol in the pedigree). This error may have occurred due to a typographical mistake or an oversight during the creation of the document.

The correct genotypes for individual 9 should be Rr, which aligns with the autosomal dominant inheritance pattern displayed in the pedigree chart.