The synthetic equivalent of corticosteroids produced by the body is called

Cortisone

Explanation:

Here is the definition if that will help out,

"A hormone produced by the adrenal cortex. One of the glucocorticoids, it is also made synthetically for use as an anti-inflammatory and anti-allergy agent."

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c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.