Trisomy 21, as illustrated by the karyotype, is caused by nondisjunction. This occurs when chromosomes do not separate properly during meiosis. 
Answer is D) nondisjunction
 
        
                    
             
        
        
        
Answer:
A. flavor of an apple from a particular tree
Explanation:
edge
 
        
             
        
        
        
The correct answer is a law
Laws explain what occurs, not why it occurs. This is a law because it states that a limp stalk of celery will become crisp if put into ice water. There is no explanation why or how it occurs, only that it will happen. 
        
                    
             
        
        
        
Answer:  Insulin is a hormone, which is secreted by the pancreas to regulate the sugar levels in the bloodstream.
Explanation:
Insulin is a protein hormone if take orally, will get digested in the digestive tract, it will not be able to affect the target site of action.
Insulin gets denatured in the digestive tract. Thus it will not be able to control the blood sugar levels.
Nancy has taken the insulin dose orally, the insulin will get denatured in the digestive system, it will not function and Nancy will remain hyperglycemic after the consumption.