In Humans, Ability to Roll the Tongue (R) Is Dominant

question 128

Multiple Choice

In humans, ability to roll the tongue (R) is dominant to being unable to roll (r) . Having freckles (F) is dominant to having no freckles (f) . A freckled tongue-roller could have which of the following genotypes?

• A)RRFF
• B)RrFf
• C)rrFF
• D)RRFF and RrFf only
• E)All of these choices are correct.

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