Question

Suppose that in humans the ability to roll the tongue (R) is dominant to being unable to roll it (r). Having freckles (F) is dominant to having no freckles (f). A freckled tongue-roller could have which genotypes? (select all that apply)

A. RrFf
B. rrff
C. rrFF
D. rrFf
E. Rrff

Answer 1

A. RrFf

Step-by-step explanation:

Given,

Ability to roll the tongue (R) is dominant over inability to roll it (r)

Freckles (F) is dominant to no freckles (f)

A freckled tongue-roller has dominant version of both the traits. So the traits will be visible even in the presence of only one dominant allele.

Thus, possible genotypes for a freckled tongue-roller will be :

RRFF

RRFf

RrFF

RrFf

Out of the give options only option A is the answer.