Depend if you are more creative or more a solver(good in math).
I think the answer would be needs. Hope this helps.
The answer is c.the individual will have an extar chromosome resulting from non-disjunction
The answer would be : <span>It is a well supported explanation which cannot become a law.
A law and a theory are different you know. In fact, the law is universel. This applies for everything unlike a theory which explains in particular why something is happening.
Any doubts ?
Hope this helps !
Photon</span>
