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

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.

velocity and height

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation: