What is the expected frequency for a person having tongue rolling ability and attached earlobe???

Answer 1

From Internet:

Attched earlobes: .16 (or 16 percent of the individuals are dominant homozygotes for this trait and have unattached earlobes) (2) heterozygote (Ee = 0.48 (or 48 percent of the individuals in this population is heterozygous at this locus and have unattached earlobes)

Rolling the tongue into a tube shape is often described as a dominant trait with simple Mendelian inheritance, and it is commonly referenced in introductory biology courses.

https://udel.edu/~mcdonald/mythtongueroll.html