Ameasurement that determines how often the allele (gene variant) expression of a particular gene arises in a population and is an indication of genetic diversity within a species population;

Allele frequency

Explanation:

Allele frequency can be described as the percentage or ratio for the existence of a particular allele in a population. Allele frequency determines which allele is present more abundantly in a population and which allele is not significantly present in the population. The allele frequency determines the genetic diversity which will be present in a population. The alleles which code for traits that make an organism more adaptable to a particular environment will have an increased allele frequency.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

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