Answer:
the answer is D.
Explanation:
The heritable variation is defined as the variance of the breeding values among individuals.
<span>The answer is b. fast / ionotropic;
slow / metabotropic. There is fast neurotransmission since the ligand – gated ion
channel receptor is directly activated by the neurotransmitter. On the other hand, G – protein coupled
receptor is bound to the neurotransmitter in order to stimulate a chemical
signaling cascade which has a longer pathway, thus, making it slow and
metabotropic.</span>
Biological therapy, hope this helps :)
To show he presence of a trait you would need to follow it through multiple generations in a pedigree.