Several days ago, mitchell fell and hurt his ankle. although it bothered him a little, he continued to walk on it. when he finally went to the doctor for x-rays, he found out he had a broken bone. it is likely that mitchell carries a gene that boosts the availability of

endorphins

Explanation:

According to my research on studies conducted by various medical professionals, I can say that based on the information provided within the question It is likely that Mitchell carries a gene that boosts the availability of endorphins. These are peptides whose main role is to activate the body's opiate receptor, which cause an effect that relieves pain. Which a gene that boosts this would allow an individual to barely feel pain in situations that would otherwise be very painful such as fracturing a bone.

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i got 3,4 and 5 as an answer