Question

Genotypes is homozygous dominant and which one homozygous recessive in regard to tounge rolling:Rr, rr, RR

Answer 1

Answer:

In context of tongue rolling, a single dominant allele 'R' is enough for the inheritance of the character.

Now,talking about genotype :

Homozygous recessive : rr

Homozygous dominant : RR

Hope it helps!