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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

Respuesta :

Answer:

A. RrFf

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.

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