Question

In humans, being a tongue roller (R) is dominant over non-roller (r). A man who is a non-roller marries a woman who is heterozygous for tongue rolling. what is the Father's genotype, mother's genotype?

Answer 1

Father is rr
Mother is Rr
Genotype consists of two alphabets actually.
Non roller means both is rr and heterozygous means different alleles (alphabets).

Answer 2

both father and mother are rr