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which of the following factors determines if someone has brown eyes or green eyes?

one dominant allele

one gene

one allele from each parent

several genes acting together

One dominant allele  determines if someone has brown eyes or green eyes

Explanation:

Dominant allele gives the expressed traits in an organism, the presence of either brown or green eyes is gotten from a parent that has dominant of such gene, hence; dominant gene would be expressed

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

the must be sensory neurons.  

hope its .