2) People who are tune deaf are unable to follow a rhythm. Scientists have evidence that
tune deafness can be genetic. The pedigree below traces the inheritance of tune deafness
in a family. Individuals in the pedigree are numbered.
Generation
10 111 112 113
ODO
Key
Tune
deaf
Normal tune
perception
Male
Female
DO
Scientists have analyzed the inheritance patterns for tune deafness and have
concluded that tune deafness is caused by an autosomal dominant allele, T.
a. Provide evidence from the pedigree that conclusively shows that the tune
deafness allele is autosomal dominant, not autosomal recessive. Explain your
reasoning.
b. Identify the genotypes of individuals 5 and 6, and then draw the Punnett square
for the cross of these two individuals.
c. Compare the expected percentage of each phenotype of the offspring from the
cross in part (b) with the actual percentage of each phenotype observed in the
children of individuals 5 and 6